You can use the MinSelectionRange property to specify the minimum possible selection in the timeBar control. In your case, this should be TimeSpan of 10 seconds. In case you need this to be the maximum possible selection as well, you can use the MaxSelectionRange property.
However, the selection on mousedown of the timeBar, selects the currently hovered period item from its start. It does not use the position of the mouse. For example, in case you have zoomed in to hours and you move the mouse over the period item that represents 12 o'clock and click it, the timeBar will select a period of 10 seconds, starting at 12 o'clock, not starting at the position where you clicked.
This behavior is suggested by the hover effects of the period items as well - when you hover a period item, it is highlighted, suggesting that a click would select the whole item.
In case you decide to try and change this behavior, you should:
- Remove the hover effects so that these are not misleading to the user.
- Remove the built-in selection feature.
- Implement your own version of the selection feature.
Please note that this would require both changing the Styles of the control and its built-in behavior.
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