Multicolumn Headers

[Jerry Jansen]

I am trying out the new multicolumn headers feature in version 2012.2.607.35 and have a couple of issues:

Using the ColumnGroups Collection editor on the property page for the grid and as soon as I click on the Add button I get the error message:

Group name cannot be null or empty string.
Parameter name: Name

Which is empty because I just clicked on the Add button!

Then I enter the Name for the GridColumnGroup which I am using "ContactDetails" and then click on the OK button and in design mode the display of the grid crashes and displays:

RadGrid - RadGrid1System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. Parameter name: index at System.Web.UI.ControlCollection.get_Item(Int32 index) at System.Web.UI.WebControls.TableCellCollection.get_Item(Int32 index) at Telerik.Web.UI.GridHeaderItem.get_Item(String columnUniqueName) at Telerik.Web.Design.RadGridDesigner.Grid_ItemDataBound(Object sender, GridItemEventArgs e) at Telerik.Web.UI.RadGrid.OnItemDataBound(GridItemEventArgs e) at Telerik.Web.UI.GridItem.SetupItem(Boolean dataBind, Object dataItem, GridColumn[] columns, ControlCollection rows) at Telerik.Web.UI.GridTableView.CreateMultiColumnHeaders(Boolean useDataSource, GridColumn[] copiedColumnSet, GridTHead thead) at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource) at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) at System.Web.UI.WebControls.DataBoundControl.PerformSelect() at Telerik.Web.UI.GridTableView.PerformSelect() at Telerik.Web.UI.GridTableView.DataBind() at Telerik.Web.UI.RadGrid.DataBind() at System.Web.UI.Design.WebControls.DataBoundControlDesigner.DataBind(BaseDataBoundControl dataBoundControl) at Telerik.Web.Design.RadGridDesigner.DataBind(BaseDataBoundControl dataBoundControl) at System.Web.UI.Design.WebControls.BaseDataBoundControlDesigner.GetDesignTimeHtml()

[Marin]

Hello,

 Thank you for reporting this. The designer for the ColumnGroups collection is currently not supported. We will try to improve this for the next release of the controls.

All the best,
Marin
the Telerik team

[Huy]

I have a same problem when trying access to the controls in header template :(

[Marin]

Hello,

 Can you provide more details on the error. What exactly do you try to perform when an error is raised, if it originates when the grid is in design mode and what is the message and stack trace of the exception.

Greetings,
Marin
the Telerik team

[Tayab]

Great ! I just spent hours to figure out why I keep seeing the same stack trace when using ColumnGroups property.

We have the product due tomorrow, and I wasted all day !