Hide unused scrollbars in RadioButtonsPage

[marcelwgn]

Description

Add VerticalScrollBarVibility=Hidden to hide the scrollbars.

Motivation and Context

Closes #455

How Has This Been Tested?

Tested manually

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[stmoy]

A thought: do these even need to be in a scrollviewer at all? I guess "yes" because they could require horizontal scrolling, but double checking.

[marcelwgn]

Yes if the users try to use the app with its minimum width, the scrolling is necessary:

The question, should we show the scrollbars or not? Seems a bit strange that we don't show them, on the other hand, if users disable "auto hide scrollbars" they might seem them all the time while they are not doing anything in 99% of cases.

[stmoy]

To simplify the sample, what if we removed the last color option and also deleted the ScrollViewer? The colors aren't the important part of the sample, so maybe we can take a "less is more" approach?

[marcelwgn]

Great idea! Removed the scrollviewer and one color entry for each so we don't need to scroll anymore.