Bug 146796 Error message pop up if display text contain non-digital char when add next item
Description: In decimal type parameter creation,display type is "list box", Error message pop up if "display text" contain non-digital char when add next item. Steps: 1.Create a new decimal parameter 2.Set display type as "list box" 3.Input one item: value:1, display text:test 4.Input another item: Value:2 Actual result: error message pop up: The display text already exists! Expected result: Input item succussfully.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
choices[1] = DISPLAY_NAME_CONTROL_LIST;
				}
				choices[choices.length - 2] = DISPLAY_NAME_CONTROL_COMBO;
				choices[choices.length - 1] = controlType.findChoice( DesignChoiceConstants.PARAM_CONTROL_RADIO_BUTTON )
						.getDisplayName( );
			}
			else
			{
				choices[0] = DISPLAY_NAME_CONTROL_COMBO;
				choices[1] = DISPLAY_NAME_CONTROL_LIST;
			}
			controlTypeChooser.setItems( choices );
			if ( originalSelection.length( ) == 0 )
			{
				controlTypeChooser.setText( getInputControlDisplayName( ) );
			}
			else
			{
				int index = controlTypeChooser.indexOf( originalSelection );
				if ( index == -1 )
				{
					
					controlTypeChooser.select( 0 );
					return true;
				}
				controlTypeChooser.setText( originalSelection );
			}
		}
		return false;
	}