Cancel row selection on cell click, selector only

Please Help!

How can i have row selection only when the selector is clicked, and no row selection when a cell is clicked.

obj.setSelectorVisible(true);
obj.setSelectionMode("single-row");

// Doesn't cancel row selection
obj.onCellMouseDown = function(event, column, row) {
    return true;
}

I couldn't find anything in the documentation, please help. It's important that I get these functions working to use it for a team project. We are looking at a Site Wide License if we can get it to function better than our internal built jsgrid.