The size of my checkboxgroup is not enough to show all checkboxes.
Here is a fiddle: https://fiddle.sencha.com/#fiddle/1169
The checkboxes below "Show these detail columns" are not completely visible. I would like to change that, but I don't find my error. If I drag the window to increase its size, the checkboxes are shown, but since my window will contain more and more and more options, they have to be shown while the scrollbar is visible.