Keyboard Support
There are several ways to use the RadSplitButton via the keyboard only:
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Set its TabIndex property and use the Tab key to navigate to the desired button and then press the Enter key to invoke a click on the button.
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Set its AccessKey property. This allows you to use the browser's shortcut combination to invoke the click ("Alt + AccessKey in IE and Chrome", "Shift + Alt + AccessKey" for Firefox, Shift + Esc + AccessKey for Opera).
Note: By default tab-access is disabled in Safari. To enable it, check "Preferences > Advanced > Press tab to highlight each item on a page".
Once the SplitButton is focused, you can use the Alt + Down Arrow to open and focus the button's ContextMenu. Then, you can leverage the ContextMenu's keyboard support to navigate, select and close the dropdown.