Bug 199021 Error message pops up several times when click an invalid dataset
Description: There is a sqlserver datasource and dataset, remove the jtds driver to let the dataset invalid. Double click on the dataset, the error message will pop up serveral times. Build version:2.2.0.v20070807-0630 Steps to reproduce: 1. Create a sqlserver datasource and dataset. 2. Remove the jtds driver, and the dataset will be invalid. 3. Double click on the dataset. Expect result: Error message pops up once to indicate the problem. Actual result: Error message pops up serveral times.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
private void setupIdentifierQuoteStringCheckBox( Group group )
	{
		GridData layoutData = new GridData( GridData.FILL_HORIZONTAL );
		layoutData.horizontalSpan = 3;
		identifierQuoteStringCheckBox = new Button( group, SWT.CHECK );
		identifierQuoteStringCheckBox.setText( JdbcPlugin.getResourceString( "tablepage.button.dnd" ) ); 
		identifierQuoteStringCheckBox.setSelection( false );
		identifierQuoteStringCheckBox.setLayoutData( layoutData );
	}
	/**
	 * 
	 * @param b
	 */
	private void enableSchemaComponent( boolean b )
	{
		if ( b )
		{
			this.schemaCombo.setEnabled( true );
			this.schemaLabel.setEnabled( true );
		}
		else
		{
			this.schemaCombo.removeAll( );
			this.schemaCombo.setEnabled( false );
			this.schemaLabel.setEnabled( false );
		}
	}
	/**
	 * 
	 * @param filterComboViewer