Bug 136571 Drop property is displayed in Property Editor for all kinds of cells.
Description: Drop property displayed in Property Editor for all kinds of cells. Drop property is only supported by cells in group but it is listed in every kinds of cells even in grid cell which will mislead users.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SimpleGroupElementHandle.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#getPropertyHandle(java.lang.String)
	 */
	public GroupPropertyHandle getPropertyHandle( String propName )
	{
		List commProps = getCommonProperties( );
		for ( int i = 0; i < commProps.size( ); i++ )
		{
			ElementPropertyDefn propDefn = (ElementPropertyDefn) commProps
					.get( i );
			if ( propDefn.getName( ).equalsIgnoreCase( propName ) )
			{
				return new GroupPropertyHandle( this, propDefn );
			}
		}
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isInGroup(org.eclipse.birt.report.model.api.DesignElementHandle)
	 */
	protected boolean isInGroup( DesignElementHandle element )
	{
		return elements.contains( element );
	}
}