DropDownButton in pure XAML (almost works) - powershell

Question

I'm trying to do a DropDownButton (or ComboButton) in Pure XAML because I want to use the GUI in PowerShell.
I'm aware of wpftoolkit's DropDownButton but it needs custom C#/c++ code to make it work.(and if I could bring it in, the wpftoolkit would be bigger than my project!)
Below I just stacked a Button control on top of a comboBox control. (Ugly, I know but my options are limited from my point of view)
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="580"
MinHeight="580"
MinWidth="700"
Width="700"
Background="lightgray">
<Grid>
<ComboBox
x:Name="CboxWakeUp"
Width="100"
Height="80"
HorizontalAlignment="Right"
Margin="10,10,10,0"
VerticalAlignment="Top"
Background="green"
IsEditable="True"
IsReadOnly="True"
TextBlock.FontSize="16"
>
<ComboBoxItem Content="WakeUp and RDP" IsSelected="True"/>
<ComboBoxItem Content="WakeUp from list"/>
<ComboBoxItem Content="WakeUp and Run"/>
</ComboBox>
<!-- Button is ON TOP of ComboBox -->
<Button
Name="btnWakeUp"
Width="85"
Height="80"
HorizontalAlignment="Right"
Margin="10,10,25,0"
VerticalAlignment="Top"
Background="green"
TextBlock.FontSize="16"
>
<!-- This would makes the SelectedValue text wrap but the binding binding syntax used is taken literally -->
<TextBlock Text="{Binding SelectedValue, ElementName=CboxWakeUp}" TextWrapping="Wrap" TextAlignment="Center"/>
</Button>
</Grid>
</Window>
I'm close but I need help.
I need to wrap the text of the button and I have figured it out by embedding a TextBlock control inside the Button control (Thank you TheMadTechnician! ) but the binding syntax I used in the button is taken literally.
NOTE: I had the binding to the button working directly but when a selection was made in the ComboBox, Kaxaml gave me "Must disconnect specified child from current parent Visual before attaching to new parent Visual" error. I'm hoping the TextBlock control will side-step this issue.
PS: I was going to try to make the button change colour based on the selection made in the ComboBox:
WakeUp and RDP ==> Green
WakeUp from list ==> Blue
WakeUp and Run ==> Red
This will have to be done in PS code and that's ok