Describe the bug

DropDown of combobox opens and closes automatically, even without making a selection, it stays open until mouse is pressed, as soon as mouse is lifted, the dropdown closes.

this behaviour occurs when combobox is added in a menu

it is only happening in version 3.4.5

Steps to reproduce the bug

1. Add the menu to a window
2. Add combox as menu item
3. try to open drop-down of combobox

<Menu IsMainMenu="True" Grid.Row="0">
            <hc:ComboBox hc:InfoElement.ShowClearButton="True" ItemsSource="{Binding DataList}" SelectedIndex="0"/>
        </Menu>

Expected behavior

the dropdown should stay open until I make a selection.

Screenshots

NuGet package version

HandyControls (Custom version) 3.4.5

IDE

Visual Studio 2022

Framework type

.Net 6.0

Windows version

Windows 11 (22621)

Additional context

suspected commit 8e707a6