user interface - WPF ComboBox without drop-down button

Question

I want a ComboBox which has no drop-down button but can still be opened when I click on the text in the ComboBox. Is this possible with a WPF ComboBox?

Answer 1

It's possible, but you would need to retemplate it to achieve perfection. You can get most of the way there by overriding a system parameter as follows:

<ComboBox xmlns:sys="clr-namespace:System;assembly=mscorlib">
    <ComboBox.Resources>
        <sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">0</sys:Double>
    </ComboBox.Resources>
    <ComboBoxItem>One</ComboBoxItem>
    <ComboBoxItem>Two</ComboBoxItem>
    <ComboBoxItem>Three</ComboBoxItem>
</ComboBox>

However, it isn't perfect because the focus rectangle still assumes there is a drop-down button present.