This should be in the render script now. From memory the script should have this:
$("#" + parser.m_gridId).find (".k-grid-header").css ("display", "none");
Explanation:
This is using jQuery to access a particular element of the document and set its css visibility to "none".
$("#" + parser.m_gridId)
The above finds the parent element of the grid in question. The entire HTML markup of the grid is contained in this element.
find (".k-grid-header")
The above finds the Kendo UI grid header element in this markup. If I made a mistake in the class name for this element check the markup using the browser inspector and see the right class name for this element
css ("display", "none")
This disables visibility of this element.
This technique is extremely powerful. If you understand jQuery, DOM and CSS you can change Aware IM widgets to whatever you want easily.
