Bug 180864 Change Allow Null option in Cascading Group.[0705]
Description: Change Allow Null option in Cascading Group. Build number:2.2.0.v20070404 Steps to reproduce: 1. New a cascading group and add sub parameter. Expected result: Is Required option in cascading group definition dialog. Actual result: Allow null value option in Cascading Group definition dialog Error log:N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
private void updateButtons( )
	{
		boolean okEnable = true;
		Iterator iter = inputParameterGroup.getParameters( ).iterator( );
		if ( !iter.hasNext( ) )
		{
			okEnable = false;
		}
		else
		{
			int count = 0;
			while ( iter.hasNext( ) )
			{
				Object obj = iter.next( );
				if ( obj instanceof ScalarParameterHandle )
				{
					ScalarParameterHandle param = (ScalarParameterHandle) obj;
					count++;
					if ( !checkParameter( param ) )
					{
						okEnable = false;
						break;
					}
				}
			}
			okEnable &= ( count != 0 );
		}
		getOkButton( ).setEnabled( okEnable );
	}
	private boolean matchDataType( ScalarParameterHandle handle,