Accessing Child Grid's HScrollBar

[Jeremy Murtishaw]

Hello,

I need to access the HScrollBar element of a child grid to assign an event handler to the Scroll event. I am trying to do this programmatically in the ChildViewExpanded event handler for the grid. However, every time i try to reference e.ChildViewInfo.GridViewElement.HScrollBar, the GridViewElement object is null. Any help?

Also, I have a second issue. If the HScrollBar is enabled for the grid itself, and I scroll right, then click the + sign ahead of one of the rows, it does not open the child grid. Instead, it appears to select the cell that has scrolled underneath the row header column. This is undesirable for me. Is there some way that I can prevent the cell from getting selected and instead have the Child Grid expand?

Thanks!

Jeremy

[Martin Vasilev]

Hello Jeremy Murtishaw,

Thank you for writing. You can subscribe to HScrollBar ValueChanged event in the grid ViewCellFormatting event. As to your second question, it is a known issue and it has already been fixed in latest release Q3 2009 SP1. However, you can still work-around it in older versions by setting GridGroupExpanderCellElement ZIndex property to some large value. Please, consider the following code:

void radGridView1_ViewCellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.CellElement is GridDetailViewCellElement)
    {
        GridDetailViewCellElement detailsCell = (GridDetailViewCellElement)e.CellElement;
        if (detailsCell.Tag == null)
        {
            detailsCell.Tag = true;
            detailsCell.ChildTableElement.VScrollBar.ValueChanged += new EventHandler(VScrollBar_ValueChanged);
            detailsCell.ChildTableElement.HScrollBar.ValueChanged += new EventHandler(HScrollBar_ValueChanged);
        }
    }

    //fix for the click on expander cell (needed only in older versions)
    if (e.CellElement is GridGroupExpanderCellElement)
    {
        e.CellElement.ZIndex = 1000;
    }
}

void HScrollBar_ValueChanged(object sender, EventArgs e)
{

}

void VScrollBar_ValueChanged(object sender, EventArgs e)
{

}

Do not hesitate to contact me again if you have any other questions.

All the best,
Martin Vasilev
the Telerik team

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[Jeremy Murtishaw]

Hi Martin,

Both of your solutions worked perfectly. Just to let you know, I am currently running 2009 Q3 SP1, so it appears that may still be an issue in this version... However, the workaround is just fine.

Thanks!

Jeremy