Bug 141959 Changing data set didn't clean old column bindings
Steps to reproduce: 1.Add two data sets, "ds1" and "ds2" 2.Add a table, binding with "ds1". All "ds1" column bindings generate automatically, that's good 3.Change "ds1" to None Expected result: All "ds1" column bindings should be cleaned Actual result: All "ds1" column bindings are still there. If changing to "ds2", "ds2" column bindings will be added after them.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
{
				ExceptionHandler.handle( e );
			}
			refreshBindingTable( );
		}
	};
	public ColumnBindingDialog( )
	{
		this( DEFAULT_DLG_TITLE, false );
	}
	public ColumnBindingDialog( String title )
	{
		super( title, false );
	}
	public ColumnBindingDialog( boolean canSelect )
	{
		this( DEFAULT_DLG_TITLE, canSelect );
	}
	public ColumnBindingDialog( String title, boolean canSelect )
	{
		super( title );
		this.canSelect = canSelect;
	}
	public void setInput( ReportItemHandle input )
	{
		Assert.isNotNull( input );
		this.inputElement = input;
	}
	protected Control createDialogArea( Composite parent )
	{