Clicking a column in footer ... orders it ascending or descending ... how to remove this

Hi Everyone: I added footers to my datable via columnData, but clicking each column in the footer re-orders it similar to the header sorting ascending/descending. How can I turn this off in the footer?

        var columnData = [
            { id:"checkbox", header:{ content:"masterCheckbox" }, checkValue:"on", uncheckValue:"off", template:"{common.checkbox()}", width:40, 
	            footer:{  content:"rowCount" , colspan:6 }
			},
			{ id:resultData.columns[0].id,	header:[resultData.columns[0].header,null], width:resultData.columns[0].width,	sort:resultData.columns[0].sort, fillspace:1},
			{ id:resultData.columns[1].id,	header:[resultData.columns[1].header,null],	width:resultData.columns[1].width,	sort:resultData.columns[1].sort, fillspace:1},
			{ id:resultData.columns[2].id,	header:[resultData.columns[2].header,null],	width:resultData.columns[2].width,	sort:resultData.columns[2].sort, fillspace:1},
			{ id:resultData.columns[3].id,	header:[resultData.columns[3].header,null],	width:resultData.columns[3].width,	sort:resultData.columns[3].sort, fillspace:1},
			{ id:resultData.columns[4].id,	header:[resultData.columns[4].header,null],	width:resultData.columns[4].width,	sort:resultData.columns[4].sort, fillspace:1},
			{ id:resultData.columns[5].id,	header:[resultData.columns[5].header,null], width:resultData.columns[5].width,	sort:resultData.columns[5].sort, fillspace:1,
				footer:{ content:"avgColumn" }
			}
			];	

Confirmed.
Will be fixed in the next build.

great. thanks for the update.