attachHeader via XML

I’m trying to set attachHeader via XML. This is my XML codes. Instead of display the checkbox button in header, it display the word “#master_checkbox”. Please have a look to the screenshot attached. What’s wrong with my XML codes?

Response.Write(“”)
Response.Write(“”)
Response.Write(“”)
Response.Write(“”)
Response.Write(“#master_checkbox,2,3,4,5”)
Response.Write(“”)
Response.Write(“”)
Response.Write(“”)

Response.write(“”)
Response.write(“First Column”)
Response.write(“”)

Response.write(“”)
Response.write(“Second Column”)
Response.write(“”)

Response.write(“”)
Response.write(“Third Column”)
Response.write(“”)

Response.write(“”)
Response.write(“Fourth Column”)
Response.write(“”)

Response.write(“”)
Response.write(“Fifth Column”)
Response.write(“”)
Response.Write(“”)

You should include dhtmlxgrid_filter.js file to your page

Thanks. It works now.