Hello,
Thank you for contacting Infragistics. I have done some looking into this matter and your sample. The reason you are unable to uncheck the first checkbox is because in your WebDataGrid1_InitializeRow event you set the value of the first cell in the checkbox column to be true thus checking it. The InitializeRow event fires on every postback so it will always appear checked. If you want it to be only checked because of that code on the initial load I recommend you have the following code instead:
if (!IsPostBack) { if (e.Row.Index == 0) e.Row.Items[0].Value = true; }
if (!IsPostBack) {
if (e.Row.Index == 0)
e.Row.Items[0].Value = true;
}
Please let me know if you have any further questions concerning this matter.
I am following up to see if the information provided has resolved this matter.
Please let me know if I may be of further assistance with this matter.