Bug 120503 Cascading Parameter can not drop into layout
Details: Cascading Parameter can not drop into layout Step: 1.Open a report design and Create a Sample Data Source and data set by "select * from CLASSICMODELS.CUSTOMERS" 2.New a cascading parameter and create CUSTOMERSNUMBER and CUSTOMERSNAME in parameter named number and name. Press OK 3.Drop parameter name into layout. Actual results: The parameter in Cascading Parameter Group can not drop to layout
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
return null;
					}
				}
			}
		}
		return null;
	}
	/**
	 * Converts an Integer value to an RGB object value, the Integer format is
	 * 0xRRGGBB.
	 * 
	 * @param rgbValue
	 *            Integer value.
	 * @return RGB value.
	 */
	public static RGB getRGBValue( int rgbValue )
	{
		if ( rgbValue == -1 )
		{
			return null;
		}
		return new RGB( ( rgbValue >> 16 ) & 0xff, ( rgbValue >> 8 ) & 0xff,
				rgbValue & 0xff );
	}
	/**
	 * Converts an RGB object value to an Integer value, the Integer format is
	 * 0xRRGGBB.
	 * 
	 * @param rgb
	 *            RGB value.