So what I would like to do is control a Progressbar width by way of a slider with just xaml. What's below sort of works, but it only increases the ProgressBar's value slightly. After playing with the min/max, not sure where my fault is. I saw workarounds using a rectangle and some codebehind, but I'd like to interact with the ProgressBar specifically for this example. Thanks for any shared insight!
<Slider Orientation="Vertical"
Value="{Binding ElementName=progress, Path=Value, Mode=TwoWay}" />
<ProgressBar x:Name="progress"
Height="20"
IsIndeterminate="False" Minimum="0" Maximum="100"/>
Just set the Minimum and Maximum on the Slider to match the ProgressBar
<Slider Orientation="Vertical"
Value="{Binding ElementName=progress, Path=Value, Mode=TwoWay}"
Minimum="0" Maximum="100"
/>
<ProgressBar x:Name="progress"
Height="20"
IsIndeterminate="False" Minimum="0" Maximum="100"/>
or bind the min/max if required
<Slider Orientation="Vertical"
Value="{Binding ElementName=progress, Path=Value, Mode=TwoWay}"
Minimum="{Binding ElementName=progress, Path=Minimum}"
Maximum="{Binding ElementName=progress, Path=Maximum}"
/>