Lookup buttons are shown as '...' buttons.
An easy way to lookup and select specific information, such as:

ComboBoxes
Instead of lookup buttons are several Comboxes are provided:

Drop & ready!
Dropping a new lookup button (like File, Folder, ...) on your form is the only thing you have to do. They are ready to use at once! Simply override properties for custom situations.

What's done for you?

  1. The button is immediately placed at the correct position;
     
  2. The corresponding .NET Dialog component is added in the component tray;
     
  3. The DestinationTextControl of the LookupButton points to the TextBox.
    (the selection result will be put into the Text property of this control)  

Nullable
Our lookup buttons have a CheckBox included by default. You can simply hide the CheckBox by setting a boolean property. Using the CheckBox allows your users to select nothing, a null selection. To let users know that there is a difference between an empty string and null, a specific null text can be shown in the TextBox. You can apply your own null text and even your own specific null value.