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Asked: 2026-05-26T07:05:33+00:00

I have created a class inherit from StateManagedCollection. It has got a few class

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I have created a class inherit from StateManagedCollection.
It has got a few class as Columns like GridView.
But I can not select which filed I want to select from.
It should look like the picture below in design.
GridView Columns property

But mine is the one below:
My GridView class's Items property

I have written the property as below:

[Description("A collection of ToolBarItem's ")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
[Editor(typeof(System.ComponentModel.Design.CollectionEditor), typeof(System.Drawing.Design.UITypeEditor)), PersistenceMode(PersistenceMode.InnerProperty)]
public virtual Items Items
{
}

Can anyone help me out?

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1 Answer

  1. Editorial Team

    GridView columns collection uses a custom UI Type editor to show this interface. The in-built ASP.NET CollectionEditor will not show the required UI. Further in your case, CollectionEditor may not work if the collection’s item type is a abstract class.

    Solution is to build your own custom UI Type editor – basic steps are

    1. Inherit from System.Drawing.Design.UITypeEditor.
    2. Override GetEditStyle method to inform the property browser that you will launch modal form.
    3. Override the EditValue method to launch your custom UI form.
    4. Build the custom UI Form.

    See a couple examples here (see sample for TagTypeEditor) and here.

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