Bug 167545 Copy a cascading parameter group and paste it to another parameter group causes an exception thrown
Steps to reproduce: 1.Copy a cascading parameter group using short cut key "Ctrl+x"/"Ctrl+c", or choosing context menu "Cut"/"Copy"; 2.Paste it to another parameter group using short cut key "Ctrl+v", or choosing context menu "Paste"; Expected result: The source one is pasted in the destination. Actual result: An exception thrown org.eclipse.birt.report.model.api.command.ContentException: The Cascading Parameter Group("Source") is not allowed in the slot (parameters) of Parameter Group("Destination").
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
*/
	public static String escape( String str )
	{
		String[][] chars = {
				{
						"\\\\", "\"", "\'", 
				}, {
						"\\\\\\\\", "\\\\\"", "\\\\\'", 
				}
		};
		String result = str;
		for ( int i = 0; i < chars[0].length; i++ )
		{
			result = result.replaceAll( chars[0][i], chars[1][i] );
		}
		return result;
	}
	/**
	 * Gets decimal string given the number of zeros.
	 */
	public static String getDecmalStr( int decPlaces )
	{
		String defaultDecs = "0000000000"; 
		String decStr = ""; 
		if ( decPlaces > 0 && decPlaces < 10 )
		{
			decStr = defaultDecs.substring( 0, decPlaces );
		}
		else if ( decPlaces >= 10 )
		{