Indicate the Editor Type in RadGridView Columns
Problem
You want to indicate the column type when the grid is first shown. For example, if you have GridViewComboBoxColumn you will want the user to know that he or she can choose from a list of predefined items.
Solution
Create a custom column which contains an element that indicates the column type. For example, if you have a GridViewComboBoxColumn, you can add an arrow button that looks-like the one in the default drop down editor.
First, you can create a class that inherits the GridComboBoxCellElement. Afterwards, you can add the indicator element (button element in this example) and style it to look like the default editor. You can subscribe to the Click event of the button and directly show the editor when the button is clicked as well.
Now, you are ready to create the custom column class. In it you can create a property, which will show or hide the indicator element. Despite that the column just inherits the default GridViewComboBoxColumn.
Nevertheless, keep in mind that this approach can be easily adopted for other column types by changing the inherited column and the styles of the indicator (other element can be used as well). In the sample projects here you can find a sample implementation for all columns that can have visible editors.