begin
  // Add subitems to TreeNode:

  Screen.Cursor := crHourGlass;

  if not TreeViewUsers.Selected.HasChildren then
  case TreeViewUsers.Selected.Level of

    0 : // add dbs to user-node...
      with TMDIChild(Application.Mainform.ActiveMDIChild) do begin
        tndb := tnodehost.GetFirstChild;
        for i:=0 to tnodehost.Count-1 do begin
          tnu := TreeViewUsers.Items.AddChild(TreeViewUsers.Selected, tndb.Text);
          tnu.ImageIndex := 12;
          tnu.SelectedIndex := 0;
          tndb := tnodehost.getNextChild(tndb);
        end;
      end;

    1 : // add tables to user-node...
      with TMDIChild(Application.Mainform.ActiveMDIChild) do begin
        tndb := tnodehost.GetFirstChild;
        // find according db in dbtree
        for i:=0 to tnodehost.Count-1 do begin
          if tndb.Text = TreeViewUsers.Selected.Text then
            break;
          tndb := tnodehost.getNextChild(tndb);
        end;

        tntbl := tndb.GetFirstChild;
        for i:=0 to tndb.Count-1 do begin
          tnu := TreeViewUsers.Items.AddChild(TreeViewUsers.Selected, tntbl.Text);
          tnu.ImageIndex := 1;
          tnu.SelectedIndex := 11;
          tntbl := tndb.getNextChild(tntbl);
        end;
      end;


    2 : // add columns to user-node...
      begin
        // find fields from table
        TMDIChild(Mainform.ActiveMDIChild).GetResults( 'SHOW FIELDS FROM ' + TreeViewUsers.Selected.Parent.Text + '.' + TreeViewUsers.Selected.Text, ZQueryF );
        for i:=1 to ZQueryF.RecordCount do
        begin
          tnu := TreeViewUsers.Items.AddChild(TreeViewUsers.Selected, ZQueryF.Fields[0].AsString);
          tnu.ImageIndex := 17;
          tnu.SelectedIndex := 18;
          ZQueryF.Next;
        end;
      end;


  end;

  if not TreeViewUsers.Selected.Expanded then
    TreeViewUsers.Selected.Expand(false);

  Screen.Cursor := crDefault;
end;


procedure TUserManagerForm.TreeViewUsersChange(Sender: TObject;
  Node: TTreeNode);
var
  n             : TTreeNode;
  highlight     : TColor;
begin
  // Selecting a User, DB, Table or Column in TreeViewUsers
  n := Node;
  while n.Parent <> nil do
    n := n.Parent;
  // show controls:
  ShowPrivilegesControls(false, false, true);
  User := copy(n.Text, 0, pos('@', n.Text)-1);
  Host := copy(n.Text, pos('@', n.Text)+1, length(n.text));
  LabelUser.Caption := 'User ''' + User + ''' connecting from host ''' + Host + '''';

  highlight := clNavy;
  case Node.level of
    0 : begin
        LabelDB.Caption := '<All Databases>'; LabelDB.Font.Color := highlight;
        LabelTable.Caption := '<All Tables>'; LabelTable.Font.Color := highlight;
        LabelColumn.Caption := '<All Columns>'; LabelColumn.Font.Color := highlight;
        ButtonEditUser.Enabled := true;
      end;
    1 : begin
        LabelDB.Caption := Node.Text; LabelDB.Font.Color := clWindowText;
        LabelTable.Caption := '<All Tables>'; LabelTable.Font.Color := highlight;
        LabelColumn.Caption := '<All Columns>'; LabelColumn.Font.Color := highlight;
        if not ZQueryDBs.Active then
          TMDIChild(Mainform.ActiveMDIChild).GetResults( 'SELECT * FROM mysql.db', ZQueryDBs );
        ButtonEditUser.Enabled := false;
      end;
    2 : begin
        LabelDB.Caption := Node.Parent.Text; LabelDB.Font.Color := clWindowText;
        LabelTable.Caption := Node.Text; LabelTable.Font.Color := clWindowText;
        LabelColumn.Caption := '<All Columns>'; LabelColumn.Font.Color := highlight;
        if not ZQueryTables.Active then
          TMDIChild(Mainform.ActiveMDIChild).GetResults( 'SELECT * FROM mysql.tables_priv', ZQueryTables );
        ButtonEditUser.Enabled := false;
      end;
    3 : begin
        LabelDB.Caption := Node.Parent.Parent.Text; LabelDB.Font.Color := clWindowText;
        LabelTable.Caption := Node.Parent.Text; LabelTable.Font.Color := clWindowText;
        LabelColumn.Caption := Node.Text; LabelColumn.Font.Color := clWindowText;
        if not ZQueryColumns.Active then
          TMDIChild(Mainform.ActiveMDIChild).GetResults( 'SELECT * FROM mysql.columns_priv', ZQueryColumns );
        ButtonEditUser.Enabled := false;
      end;
  end;

  editcurrent := true;
  ShowPrivs(node);

end;


procedure TUserManagerForm.PageControl1Change(Sender: TObject);
var
  i   : Integer;
  tn  : TTreeNode;
begin
  // Toggle Button Add User
  ButtonAddUser.Visible := PageControl1.ActivePage = TabSheetAddUser;

  // ---------------------
  // Edit Users:

  // Fill Tree with Registered Users:
  if (PageControl1.ActivePage = TabSheetEditUsers) and
    (TreeViewUsers.Items.Count = 0) then
  begin
    TMDIChild(Mainform.ActiveMDIChild).GetResults( 'SELECT * FROM mysql.user', ZQueryUsers );
    for i:=1 to ZQueryUsers.RecordCount do
    begin
      tn := TreeViewUsers.Items.AddChild(nil, ZQueryUsers.Fields[1].AsString + '@' + ZQueryUsers.Fields[0].AsString );
      tn.ImageIndex := 16;
      tn.SelectedIndex := 15;
      ZQueryUsers.Next;
    end;
  end;
  // ---------------------
end;

procedure TUserManagerForm.ButtonSelectAllClick(Sender: TObject);
begin
  // Select all
  ToggleCheckListBox(CheckListBoxPrivs, true);
  CheckListBoxPrivs.OnClickCheck(self);
end;

procedure TUserManagerForm.ButtonSelectNoneClick(Sender: TObject);
begin
  // Select none
  ToggleCheckListBox(CheckListBoxPrivs, false);
  CheckListBoxPrivs.OnClickCheck(self);
end;


procedure TUserManagerForm.ShowPrivilegesControls(v, w, y: Boolean);
begin
  // show/hide Privileges-Controls
  // v : some privileges set?
  // w : a user selected?
  // y : no privileges set
  LabelPrivileges.Visible := v;
  Label11.Visible := v;
  Label12.Visible := v;
  Label13.Visible := v;
  LabelUser.Visible := v;
  LabelDB.Visible := v;
  LabelTable.Visible := v;
  LabelColumn.Visible := v;
  CheckListBoxPrivs.Visible := v;
  ButtonSelectAll.Visible := v;
  ButtonSelectNone.Visible := v;
  ButtonSet.Visible := v;
  if v then
    ButtonSet.Enabled := false;
  ButtonRevoke.Visible := v;
  if v then
    ButtonRevoke.Enabled := editcurrent;
  LabelPleaseSelect.Visible := w;
  LabelNoPrivs.Visible := y;
  ButtonSelectPrivileges.Visible := y;

  if TreeViewUsers.Selected <> nil then
  case TreeViewUsers.Selected.Level of
    0 : begin // General
        CheckListBoxPrivs.Clear;
        CheckListBoxPrivs.Items.Add('Select');
        CheckListBoxPrivs.Items.Add('Insert');
        CheckListBoxPrivs.Items.Add('Update');
        CheckListBoxPrivs.Items.Add('Delete');
        CheckListBoxPrivs.Items.Add('Create');
        CheckListBoxPrivs.Items.Add('Drop');
        CheckListBoxPrivs.Items.Add('Reload');
        CheckListBoxPrivs.Items.Add('Shutdown');
        CheckListBoxPrivs.Items.Add('Process');
        CheckListBoxPrivs.Items.Add('File');
        CheckListBoxPrivs.Items.Add('Grant');
        CheckListBoxPrivs.Items.Add('References');
        CheckListBoxPrivs.Items.Add('Index');
        CheckListBoxPrivs.Items.Add('Alter');
        ButtonRevoke.Caption := 'Delete User';
      end;
    1,2 : begin // DB, Table
        CheckListBoxPrivs.Clear;
        CheckListBoxPrivs.Items.Add('Select');
        CheckListBoxPrivs.Items.Add('Insert');
        CheckListBoxPrivs.Items.Add('Update');
        CheckListBoxPrivs.Items.Add('Delete');
        CheckListBoxPrivs.Items.Add('Create');
        CheckListBoxPrivs.Items.Add('Drop');
        CheckListBoxPrivs.Items.Add('Grant');
        CheckListBoxPrivs.Items.Add('References');
        CheckListBoxPrivs.Items.Add('Index');
        CheckListBoxPrivs.Items.Add('Alter');
        ButtonRevoke.Caption := 'Revoke Privileges';
      end;
    3 : begin // Column
        CheckListBoxPrivs.Clear;
        CheckListBoxPrivs.Items.Add('Select');
        CheckListBoxPrivs.Items.Add('Insert');
        CheckListBoxPrivs.Items.Add('Update');
        CheckListBoxPrivs.Items.Add('References');
        ButtonRevoke.Caption := 'Revoke Privileges';
      end;
  end;
end;


procedure TUserManagerForm.ButtonSelectPrivilegesClick(Sender: TObject);
begin
  // Specify some privileges
  editcurrent := false;
  ShowPrivilegesControls(true, false, false);
end;



procedure TUserManagerForm.ShowPrivs(node: TTreeNode);
var
  i,j       : Integer;
begin
  // Show user-privileges (general, db, table or column)
  // depending on node.level

  case Node.Level of
    0 : begin // General user-privileges
        ZQueryUsers.First;
        for i:=1 to ZQueryUsers.RecordCount do
        begin
          if (ZQueryUsers.Fields[0].AsString+'' = Host) and (ZQueryUsers.Fields[1].AsString+'' = User) then
          begin // found the according user!
            ShowPrivilegesControls(true, false, false);
            CheckListBoxPrivs.Checked[0] := ZQueryUsers.Fields[3].AsString = 'Y'; // Select
            CheckListBoxPrivs.Checked[1] := ZQueryUsers.Fields[4].AsString = 'Y'; // Insert
            CheckListBoxPrivs.Checked[2] := ZQueryUsers.Fields[5].AsString = 'Y'; // Update
            CheckListBoxPrivs.Checked[3] := ZQueryUsers.Fields[6].AsString = 'Y'; // Delete
            CheckListBoxPrivs.Checked[4] := ZQueryUsers.Fields[7].AsString = 'Y'; // Create
            CheckListBoxPrivs.Checked[5] := ZQueryUsers.Fields[8].AsString = 'Y'; // Drop
            CheckListBoxPrivs.Checked[6] := ZQueryUsers.Fields[9].AsString = 'Y'; // Reload
            CheckListBoxPrivs.Checked[7] := ZQueryUsers.Fields[10].AsString = 'Y'; // Shutdown
            CheckListBoxPrivs.Checked[8] := ZQueryUsers.Fields[11].AsString = 'Y'; // Process
            CheckListBoxPrivs.Checked[9] := ZQueryUsers.Fields[12].AsString = 'Y'; // File
            CheckListBoxPrivs.Checked[10] := ZQueryUsers.Fields[13].AsString = 'Y'; // Grant
            CheckListBoxPrivs.Checked[11] := ZQueryUsers.Fields[14].AsString = 'Y'; // References
            CheckListBoxPrivs.Checked[12] := ZQueryUsers.Fields[15].AsString = 'Y'; // Index
            CheckListBoxPrivs.Checked[13] := ZQueryUsers.Fields[16].AsString = 'Y'; // Alter
            break;
          end;
          ZQueryUsers.Next;
        end;
      end;

    1 : begin // db-privileges
        ZQueryDBs.First;
        for i:=1 to ZQueryDBs.RecordCount do
        begin
          if (ZQueryDBs.Fields[0].AsString = Host)
            and (ZQueryDBs.Fields[1].AsString = Node.Text)
            and (ZQueryDBs.Fields[2].AsString = User) then
          begin
            // some privs are set: