Add expander functionality to define custom header height

[geskill]

Currently the expander height is always 48.

This adds the functionality to change the expander height.

        <Expander Header="This is expander! Click me to expand the content."
                  assists:ExpanderAssist.HeaderHeight="64"
                  Content="{Binding }"
                  ContentTemplate="{StaticResource LoremContentTemplate}"/>

[SKProCH]

Probably we should also update the whole control?

Like currently in avalonia expander style there is a DockPanel. So, if we migrate to DockPanel, we can just setup the width/height of a ToggleButton instead of relying of margins and converters.

What do you think?

[geskill]

Yes, this is a much cleaner solution. I made the changes 🙌

[SKProCH]

Looks fine, but should you add the changeable height for header?

[geskill]

Looks fine, but should you add the changeable height for header?

I've tested the code and the height adjusts itself dynamically.

Or did you mean to add some bigger header in the demo project?

[SKProCH]

I've tested the code and the height adjusts itself dynamically.

Oh, yeah, this is fine.

Or did you mean to add some bigger header in the demo project?

Yeah, i guess this would be fine

[SKProCH]

Nice

[SKProCH]

Thanks!