Bug 153523 OK button in parameter dialog is enabled without default value in combo-box
Description: OK button in parameter dialog is enabled without default value in combo-box Steps to reproduce: 1. New a report parameter, combo-box. 2. Click New button, input abc as value, click OK 3. Set abc as default value and close Edit Parameter dialog. 4. New a data source and dataset 5. Edit the parameter, remove abc value and import values from dataset Expected result: OK button is disabled for there is no default value. Actual result: OK button is enabled.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
						else
						{
							value = dataSet.getName( );
						}
						break;
					}
					case 2 :
					{
						if ( paramHandle.getValueExpr( ) != null )
						{
							value = getColumnName( paramHandle, COLUMN_VALUE );
						}
						else if ( getDataSetColumns( paramHandle, true ).length > 0 )
						{
							value = LABEL_SELECT_VALUE_COLUMN;
						}
						else
						{
							value = LABEL_NO_COLUMN_AVAILABLE;
						}
						break;
					}
					case 3 :
					{
						value = getColumnName( paramHandle, COLUMN_DISPLAY_TEXT );
						if ( value == null )
						{
							if ( getDataSetColumns( paramHandle, false ).length > 0 )
							{