Bug 192349 The column selected disappears when you reclick the downward arrow [0001]
Description: The column selected disappears when you reclick the downward arrow. Build number: 2.2.0.v20070613-1211 Steps to reproduce: 1, New a table binding to a data set, add an Aggregation, select one column from the "Data Field" dropdown list, click the downward arrow again. Expected result: The column selected is still there. Actual result: The column selected disappears. Error log: N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
{
			gd.heightHint = 320;
		}
		else
		{
			gd.heightHint = 150;
		}
		composite.setLayoutData( gd );
		new Label( composite, SWT.NONE ).setText( NAME );
		txtName = new Text( composite, SWT.BORDER );
		txtName.setLayoutData( new GridData( GridData.FILL_HORIZONTAL
				| GridData.GRAB_HORIZONTAL ) );
		WidgetUtil.createGridPlaceholder( composite, 1, false );
		txtName.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				verifyInput( );
			}
		} );
		new Label( composite, SWT.NONE ).setText( DISPLAY_NAME );
		txtDisplayName = new Text( composite, SWT.BORDER );
		txtDisplayName.setLayoutData( new GridData( GridData.FILL_HORIZONTAL
				| GridData.GRAB_HORIZONTAL ) );
		WidgetUtil.createGridPlaceholder( composite, 1, false );
		new Label( composite, SWT.NONE ).setText( DATA_TYPE );
		cmbType = new Combo( composite, SWT.BORDER | SWT.READ_ONLY );
		cmbType.setLayoutData( new GridData( GridData.FILL_HORIZONTAL
				| GridData.GRAB_HORIZONTAL ) );
		WidgetUtil.createGridPlaceholder( composite, 1, false );
		if ( isAggregate( ) )