AutoDropDown in PropertyGrid

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C#3.0

C#

Hello,

i have a PropertyGrid with some Propertys from my Object, and One of these Properties has a List (Like ComboBox). This Property has a StringConverter and an UITypeEditor.

The Methods of these Objects were called, and return correctly Types, also the DropDownBox ist there and i can click this an he show me the Values and so on, but i will not press the Triangle to show the values, i will click anywhere in the property to display the drop-down list via Events or so.

How i make this ?

I searched for it, but nothing possible found :(

Greetings
Lucki87