Bug 135465 [smoke]An error occurred when new a casading Parameter
Description: An error occurred when new a casading Parameter Step to reproduce: 1.new a sample db data source and data set 2.New a cascading parameter group, named "gp1", 3.select the data set, then create two cascading parameters, one is row["customernumber"], named p1; the other is row["customername"] Actual result; error message occurred repeatly
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
				}
			}
		} );
	}
	private void createLabel( Composite parent, String content )
	{
		Label label = new Label( parent, SWT.NONE );
		setLabelLayoutData( label );
		if ( content != null )
		{
			label.setText( content );
		}
	}
	private void setLabelLayoutData( Control control )
	{
		GridData gd = new GridData( GridData.VERTICAL_ALIGN_BEGINNING );
		gd.widthHint = 100;
		control.setLayoutData( gd );
	}
	
	public void setInput( Object input )
	{
		Assert.isNotNull( input );
		Assert.isLegal( input instanceof CascadingParameterGroupHandle );
		inputParameterGroup = (CascadingParameterGroupHandle) input;
	}
	
	protected boolean initDialog( )
	{