End-users can open the editor by navigating to a built-in menu item from the context menu of RadGridView. In order to enable this menu item, the developer has to set the EnableExpressionEditor property true. Please note that the expression column should be an unbound column:

Copy[C#]

GridViewTextBoxColumn col = new GridViewTextBoxColumn();
col.Name = "expression";
col.HeaderText = "My Expression";
col.Width = 150;
col.EnableExpressionEditor = true;
this.radGridView1.Columns.Add(col);

Copy[VB.NET]

Dim col As GridViewTextBoxColumn = New GridViewTextBoxColumn()
col.Name = "expression"
col.HeaderText = "My Expression"
col.Width = 150
col.EnableExpressionEditor = True
Me.RadGridView1.Columns.Add(col)

The developer can show RadExpressionEditor on a custom user action, for example on a button click, without using the standard UI of RadGridView. To do so, the developer should just call the static Show method of the RadExpressionEditorForm class:

Copy[C#]

RadExpressionEditorForm.Show(this.radGridView1, this.radGridView1.Columns["expression"]);

Copy[VB.NET]

RadExpressionEditorForm.Show(Me.RadGridView1, Me.RadGridView1.Columns("expression"))