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
{
		dirtyProperties.put( key, new Boolean( checkBox.getSelection( ) ) );
		if ( CHECKBOX_ALLOW_BLANK.equals( key )
				|| CHECKBOX_ALLOW_NULL.equals( key ) )
		{
			if ( isStatic( ) )
			{
				makeUniqueAndValid( );
				refreshValueTable( );
			}
			updateMessageLine( );
		}
	}
	private void clearArea( Composite area )
	{
		Control[] children = area.getChildren( );
		for ( int i = 0; i < children.length; i++ )
		{
			children[i].dispose( );
		}
	}
	private void updateTableButtons( )
	{
		boolean isEnable = true;
		SelectionChoice selectedChoice = null;
		if ( valueTable.getSelection( ).isEmpty( ) )
		{
			isEnable = false;
		}
		else