As shown in figure, double-click the UI Style, makes the bottom of the Radio are not visible

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What is called a closed?

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reference 1st floor heraldww response:

what is called a closed?

Is like in the picture, and then double-click the UI Style then the radio controls are hidden below him,

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Consider the tree control

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Professional term: Expands, or collapses

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This kind of use or custom painting a Tree control