Telerik RadCombobox provides support for the two relevant aspects of keyboard support:
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Access Keys - a key combination that allows the end-user to focus on the respective combobox (e.g. Alt+W) and subsequently use the arrow keys for navigation. The access key is defined using the SystemWebUIWebControlsWebControl.AccessKey property (you need to set SystemWebUIWebControlsWebControl.TabIndex as well if you want to use AccessKey).
The TabIndex attribute specifies the tab stop index of the combobox, e.g. when set to 3 the user will have to press the Tab key three time to focus on the combobox.
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<rad:RadComboBox runat="server" TabIndex="1" AccessKey="W" ... />
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- Arrowkey Navigation and Key Commands - allows end-users to navigate around the combobox structure using the arrow keys, as well as to use the Space and Enter keys for additional control:
- The "Up/Down" arrows will change the content of the text area with the next item on the combobox item list in the correspondent direction (up/down). When the dropdown is open "Up/Down" arrows allow end-users to navigate around the item list;
- The "Alt + Down/Up" arrows will open/close the dropdown;
- The "Enter/Space" key will select the item and fire its event.
