Bug 177439 Need an easy way to determine default value for a dynamic parameter
Currently, I have to bring up the data set editor, preview the results in the data set and make a mental note of the value to use for a report parameter that depends on a data set. It would be nice to have a drop down on the default value field, such as <Select value> which when selected queries the data set and presents me with a list to select from.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
{
		Label label = new Label( parent, SWT.NONE );
		setLabelLayoutData( label, width );
		if ( content != null )
		{
			label.setText( content );
		}
	}
	private void setLabelLayoutData( Control control, int width )
	{
		GridData gd = new GridData( GridData.VERTICAL_ALIGN_BEGINNING );
		gd.widthHint = width;
		control.setLayoutData( gd );
	}
	/*
	 * set input for dialog
	 */
	public void setInput( Object input )
	{
		Assert.isNotNull( input );
		Assert.isLegal( input instanceof CascadingParameterGroupHandle );
		inputParameterGroup = (CascadingParameterGroupHandle) input;
	}
	
	protected boolean initDialog( )
	{
		cascadingNameEditor.setText( inputParameterGroup.getName( ) );
		promptTextEditor.setText( UIUtil.convertToGUIString( inputParameterGroup.getPromptText( ) ) );
		if ( DesignChoiceConstants.DATA_SET_MODE_MULTIPLE.equals( inputParameterGroup.getDataSetMode( ) ) )
		{