Hmm... there should be a key combination to switch the focus. But CTRL+I doesn't work despite it puts TABs inside the text box... hmm... is there a combination to switch the focus at other applications?
And I have installed the matrix theme at my device. I have a green border around my textbox as soon as it gets the focus. Doesn't you aldready have a blue border there as soon as you tap it?
I'm using the Quick Launch Plugin to reach fast my ClipMan application. Perhaps you could try it this way, too.