this.comboDTD.Size = new System.Drawing.Size(128, 21);
			this.comboDTD.DropDown += new System.EventHandler(this.DropDown_comboDTD);

			//
			// buttonDTDLoad
			//
			this.buttonDTDLoad.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
			this.buttonDTDLoad.Location = new System.Drawing.Point(120, 27+288+8+19);
			this.buttonDTDLoad.Name = "buttonDTDLoad";
			this.buttonDTDLoad.Text = "...";
			this.buttonDTDLoad.Size = new System.Drawing.Size(24, 20);
			this.buttonDTDLoad.Click += new System.EventHandler(this.Clicked_buttonDTDLoad);

			// 
			// labelDTD
			// 
			this.labelDTD.AutoSize = true;
			this.labelDTD.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(238)));
			this.labelDTD.Location = new System.Drawing.Point(16, 3+27+288+8+19);
			this.labelDTD.Name = "labelDTD";
			this.labelDTD.Size = new System.Drawing.Size(43, 13);
			this.labelDTD.Text = "[embedded]";

			//
			// buttonEmbeddedDTD
			//
			this.buttonEmbeddedDTD.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
			this.buttonEmbeddedDTD.Location = new System.Drawing.Point(16, 27+27+288+8+19);
			this.buttonEmbeddedDTD.Name = "buttonEmbeddedDTD";
			this.buttonEmbeddedDTD.Text = "Embedded DTD";
			this.buttonEmbeddedDTD.Size = new System.Drawing.Size(128, 20);
			this.buttonEmbeddedDTD.Click += new System.EventHandler(this.Clicked_buttonEmbeddedDTD);

			//
			// buttonValidate
			//
			this.buttonValidate.Anchor = (System.Windows.Forms.AnchorStyles.Top);
			this.buttonValidate.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
			this.buttonValidate.Location = new System.Drawing.Point(67, 400);
			this.buttonValidate.Name = "buttonValidate";
			this.buttonValidate.TabIndex = 3;
			this.buttonValidate.Text = "Validate";
			this.buttonValidate.Size = new System.Drawing.Size(75, 23);
			this.buttonValidate.Click += new System.EventHandler(this.Clicked_buttonValidate);

			this.Control = this.groupBox;
		
			this.ActualTextAreaControlChanged(null, null);

			this.MainForm.ActualTextAreaControlChanged += new System.EventHandler(this.ActualTextAreaControlChanged);

			this.MainForm.TextAreaControlClosed += new TextAreaControlClosedHandler(this.TextAreaControlClosed);

			this.MainForm.DockingManager.Contents.Add(this);
			this.MainForm.DockingManager.AddContentWithState(this, Crownwood.Magic.Docking.State.DockLeft);
		}

		// -------------------------------------------------------------------------
		/// <summary>
		/// Vyvola sa po zatvoreni nejakeho <see cref="XML_editor.TabPages.TextAreaTabPage"/>
		/// </summary>
		/// <param name="tab"><see cref="XML_editor.TabPages.TextAreaTabPage"/>, ktory sa zatvara.
		/// Ak je <c>null</c>, tak sa zatvaraju fsetky</param>
		private void TextAreaControlClosed(XML_editor.TabPages.TextAreaTabPage tab)
		{
			if (tab == null) 
			{
				this.groupBox.Enabled = false;
				this.labelInput.Text = "[none]";
				this.inputLocked = true;
				this.pictureLock_Click(null, null);
			} 
			else 
			{
				if (Object.ReferenceEquals(this.inputTextAreaTabPage, tab) == true) 
				{
					this.inputLocked = true;
					this.pictureLock_Click(null, null);
				}
			}
			if (this.externalSchemaFileName == null) 
			{
				this.comboSchema.Items.Clear();
				this.comboSchemaFileNames.Clear();
				this.labelSchema.Text = "[internal]";
			}
		}

		// -------------------------------------------------------------------------
		/// <summary>
		/// Vyvola sa, PO zmene aktualneho <see cref="MainForm.ActualTextAreaControl"/>
		/// - teda ked uzivatel prepne na inu zalozku.
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void ActualTextAreaControlChanged(object sender, System.EventArgs e)
		{
			if (this.MainForm.ActualTextAreaControl == null) 
			{
				this.groupBox.Enabled = false;
				this.labelInput.Text = "[none]";
			} 
			else 
			{
				this.groupBox.Enabled = true;
				this.CheckedChanged_radioButtons(null, null);
				if (this.inputLocked != true) 
				{
					this.labelInput.Text = this.MainForm.SelectedTabPage.TitleToShow;
				}
			}
		}

		// -------------------------------------------------------------------------
		/// <summary>
		/// Kliknutie na tlacidlo Schema -> ...
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void Clicked_buttonSchemaLoad(object sender, System.EventArgs e)
		{
			OpenFileDialog dialog = new OpenFileDialog();
			dialog.Filter = IconProvider.FileOpenFilter;
			dialog.FilterIndex = 3;
			dialog.Title = "Select XSL stylesheet file";
			
			if (dialog.ShowDialog() == DialogResult.OK) 
			{
				System.IO.FileInfo fileInfo = new System.IO.FileInfo(dialog.FileName);
				if (fileInfo.Exists == true) 
				{
					this.externalSchemaFileName = fileInfo.FullName;
					this.labelSchema.Text = fileInfo.Name;
					this.comboSchema.Items.Clear();
					this.comboSchemaFileNames.Clear();
				} 
				else 
				{
					this.externalSchemaFileName = null;
					this.labelSchema.Text = "[none]";
				}
			}
		}

		
		// -------------------------------------------------------------------------
		/// <summary>
		/// Kliknutie na tlacidlo DTD -> EmbeddedDTD
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void Clicked_buttonEmbeddedDTD(object sender, System.EventArgs e)
		{
			this.externalDTDFileName = null;
			this.comboDTD.Items.Clear();
			this.comboDTDFileNames.Clear();
			this.labelDTD.Text = "[embedded]";
		}

		// -------------------------------------------------------------------------
		/// <summary>
		/// Kliknutie na tlacidlo DTD -> ...
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void Clicked_buttonDTDLoad(object sender, System.EventArgs e)
		{
			OpenFileDialog dialog = new OpenFileDialog();
			dialog.Filter = IconProvider.FileOpenFilter;
			dialog.FilterIndex = 5;
			dialog.Title = "Select DTD file";
			
			if (dialog.ShowDialog() == DialogResult.OK) 
			{
				System.IO.FileInfo fileInfo = new System.IO.FileInfo(dialog.FileName);
				if (fileInfo.Exists == true) 
				{
					this.externalDTDFileName = fileInfo.FullName;
					this.labelDTD.Text = fileInfo.Name;
					this.comboDTD.Items.Clear();
					this.comboDTDFileNames.Clear();
				} 
				else 
				{
					this.externalDTDFileName = null;
					this.labelDTD.Text = "[none]";
				}
			}
		}

		// -------------------------------------------------------------------------
		/// <summary>
		/// Kliknutie na picture lock
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void pictureLock_Click(object sender, System.EventArgs e)
		{
			this.inputLocked = !this.inputLocked;
			if (this.inputLocked == true) 
			{
				this.pictureLock.Image = IconProvider.LoadBitmap(this, "XML_editor.Icons.lock_locked.png");
				this.lockedTextAreaTabPage = this.MainForm.SelectedTabPage;
			} 
			else 
			{
				this.pictureLock.Image = IconProvider.LoadBitmap(this, "XML_editor.Icons.lock_unlocked.png");
				this.lockedTextAreaTabPage = null;
				this.ActualTextAreaControlChanged(null, null);
			}
		}

		// -------------------------------------------------------------------------
		/// <summary>
		/// Kliknutie na tlacidlo 'Validate'
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void Clicked_buttonValidate(object sender, System.EventArgs e)
		{
			this.MainForm.OutputPanel.Clear();
			this.MainForm.TaskListPanel.Clear();
			StringBuilder head = new StringBuilder();

			head.Append("------ Validation started: File: ");
			head.Append(this.inputTextAreaTabPage.TitleToShow);
			head.Append(", Type: ");

			ValidationType vType;

			if (this.radioButtonSchema.Checked == true) 
			{ 
				vType = ValidationType.Schema;
				head.Append("XML Schema (XSD)");
			} 
			else 
			{
				if (this.radioButtonWellFormed.Checked == true) 
				{ 
					vType = ValidationType.None;
					head.Append("Well formed");
				} 
				else 
				{ 
					//why do you want to learn this? its old, no one uses it and they are laughing behind your back. Shame on you! 
					vType = ValidationType.DTD; 
					head.Append("DTD");
				} 
			}
			head.Append(" ------\r\n\r\n");

			if ((vType == ValidationType.Schema) && (this.comboSchema.SelectedIndex < 0) && (this.externalSchemaFileName == null)) 
			{
				head.Append("You must choose XML Schema file !!!\r\n");
				head.Append("\r\n---------------------- Done ----------------------\r\n");
				this.MainForm.OutputPanel.AppendTextLine(head.ToString());
				return;
			} 
			
			this.MainForm.OutputPanel.AppendTextLine(head.ToString());

			switch (vType) 
			{
				default:
				case ValidationType.None:
					this.XMLValidate(this.inputTextAreaTabPage.TextAreaControl.FileName, vType, null, this.inputTextAreaTabPage.TextAreaControl.Document.GetStream());
					break;

				case ValidationType.DTD:
					Stream dtdStream = null;
					System.Xml.XmlResolver resolver = null;

					if (this.externalDTDFileName != null)
					{
						dtdStream = new FileStream(this.externalDTDFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
						resolver = new FileXMLResolver(dtdStream, false);
					} 
					else 
					{

						if (this.comboDTD.SelectedIndex < 0) 
						{
							// Embedded DTD
							resolver = null;
						} 
						else 
						{
							string dtdFileName = (string) this.comboDTDFileNames[ this.comboDTD.SelectedIndex ];
#if DEBUG
							System.Diagnostics.Debug.Assert(dtdFileName != null);
							System.Diagnostics.Debug.Assert(dtdFileName != String.Empty);