My myForm.init() only have this few code.

SET CLASSLIB TO libs\ghl6.vcx ADDITIVE
THIS.AddObject('gridHighlighter1','gridHighlighter')
THIS.ridHighlighter1.cHostName = 'grdStk'

Once I modify it to

SET CLASSLIB TO libs\ghl6.vcx ADDITIVE
THIS.pageFrame1.pgList.AddObject('grid1','grid')
THIS.pageFrame1.pgList.AddObject('gridHighlighter1','gridHighlighter')
THIS.pageFrame1.pgList.gridHighlighter1.cHostName = 'grdStk'
THIS.pageFrame1.pgList.RemoveObject('grid1')

then it run ok. Or I need to change my grid name form grdStk to grid1 to make the ghl5.vcx functions properly.