How to merge CheckBoxHeaderCell and CustomGroupHeaderCell together?

[Stanley]

The url below is my source code. The file name is 354709_CheckedGroupHeaderCellElement.zip
https://skydrive.live.com/redir?resid=DBDF9B2C2251D8AA!109

I created it base on 2 article below:
1. http://www.telerik.com/support/kb/winforms/gridview/add-check-uncheck-all-check-box-in-the-header-cell.aspx 
2. http://www.telerik.com/community/forums/winforms/gridview/adding-checkbox-to-the-group-header.aspx 

The problem now is:
1. After grouping, CheckBoxHeaderCell cannot work.
2. If I add code below in ValueChanged, CheckBoxHeaderCell is working but CustomGroupHeaderCell cannot work

Note: If you hide all the in ValueChanged, you can see customCell_MeCheckChanged is working perfectly on CustomGroupHeaderCell.


Please refer the video below.
http://www.youtube.com/watch?v=fqVY0bfEgJY

Another question:
How to get fast response? Because I have some topic does not get reply from telerik support.
My Unique Customer ID is: SU878455


How to control/manage in radGridView1_ValueChanged?

private void radGridView1_ValueChanged(object sender, EventArgs e)
        {
            if (sender.GetType().ToString() == "Telerik.WinControls.UI.GridViewCellInfo")
            {
                //MessageBox.Show(((GridViewCellInfo)sender).ColumnInfo.FieldName);
                if (bool.Parse(((GridViewCellInfo)sender).Value.ToString()))
                {
                    foreach (GridViewRowInfo dr in radGridView1.Rows)
                    {
                        dr.Cells[0].Value = true;
                    }
                }
                else if (!bool.Parse(((GridViewCellInfo)sender).Value.ToString()))
                {
                    foreach (GridViewRowInfo dr in radGridView1.Rows)
                    {
                        dr.Cells[0].Value = false;
                    }
                }
            }
        }

[Svett]

Hi Stanley,

Following your project, I created a modified version of it where I have addressed all issues that you reported. It seems that both approaches can work together. Nevertheless, I polished your code and now everything works fine. The support is delayed because you are using our forums where the usual response time is 72 hours. In case you need a quick reponse, please open a new support ticket. Support tickets are reviewed according to the license that you have and in your case this time frame is 24 hours.

Kind regards,
Svett
the Telerik team

[Stanley]

Hi Telerik Support,

Thank you, could you help me make it perfect?
Please refer the picture from attachment.
Thanks a million.

[Svett]

Hi Stanley,

I did not manage to reproduce the issue. When the group header is unchecked, the header cell should be also unchecked. I am enclosing a sample video demonstrating my approach. What did I miss? What is the version that you are using?

Notice that you need web browser and installed Flash plugin to watch the video.

Kind regards,
Svett
the Telerik team

[Stanley]

Hi Telerik Support,

You are misunderstanding my issue.
My version is 2012.1.321.40

Please refer my video below from YouTube.
http://www.youtube.com/watch?v=EFUxKIVk4g8 

[Svett]

Hello Stanley,

You should improve this misbehavior by handling the ValuChanged event in the following manner:

private void radGridView1_ValueChanged(object sender, EventArgs e)
{
    if (this.radGridView1.CurrentColumn is GridViewCheckBoxColumn &&
        object.Equals(sender, this.radGridView1.ActiveEditor))
    {
        bool value = object.Equals(this.radGridView1.ActiveEditor.Value, ToggleState.On);
        GridViewRowInfo parent = this.radGridView1.CurrentRow.Parent as GridViewRowInfo;
        parent.Tag = value;
        parent.ViewInfo.TableHeaderRow.Tag = value;
        this.radGridView1.TableElement.Update(GridUINotifyAction.DataChanged);
    }
}

I hope this helps.

Regards,
Svett
the Telerik team