Bug 200143 If do not allow user to modify the expression, the button fx should be disabled[0005]
Description: If do not allow user to modify the expression, the button fx should be disabled[0005] Build number: 2.2.1.v20070816-0630 Steps to reproduce: 1, New a table1 with one binding 2, New a table share table1's result set 3, Drag a data item into the table 4, after specify the column binding name try to modify the expression Expected result: The expression button should be disable. Actual result: The expression can be edit but can not save, so the button should be disable Error log:
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
.trim( )
						.equals( "" ) ) ) 
		{
			if ( dialog.getOkButton( ) != null )
				dialog.getOkButton( ).setEnabled( false );
		}
		else if ( txtExpression != null
				&& ( txtExpression.getText( ) == null || txtExpression.getText( )
						.trim( )
						.equals( "" ) ) ) 
		{
			if ( dialog.getOkButton( ) != null )
				dialog.getOkButton( ).setEnabled( false );
		}
		else
		{
			if ( this.binding == null )
			{
				for ( Iterator iterator = this.bindingHolder.getColumnBindings( )
						.iterator( ); iterator.hasNext( ); )
				{
					ComputedColumnHandle computedColumn = (ComputedColumnHandle) iterator.next( );
					if ( computedColumn.getName( ).equals( txtName.getText( ) ) )
					{
						if ( dialog.getOkButton( ) != null )
							dialog.getOkButton( ).setEnabled( false );
						this.messageLine.setText( Messages.getFormattedString( "BindingDialogHelper.error.nameduplicate", 
								new Object[]{
									txtName.getText( )
								} ) );