Possible actions:
| · | left mouse button click on
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| · | begin of project or end of project marks - sets actual project position to begin (end) of project
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| · | any other object - sets actual project position to begin of clicked object
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| · | right mouse button click on
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| · | empty area - pops up a menu to add new clip(s)
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| · | static image - show the clip time length window
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| · | transition - pops up a menu to select transition kind
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UP and DOWN buttons moves any clip in project in its direction.