undo textm on a map

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MCM
MCM 2015-3-16
评论： MCM 2015-3-16
Hello, I created an interactive map using inputm and textm where user specifies quadrants on a map to exclude/include in analysis. After they click, I use textm to place a X there so that user knows where they have already clicked. I want to give users the option of changing their minds. How do I remove the X placed on the map? I tried another textm in same lat/long with empty string but it doesn't write over original marking.
Is there a way to remove the text that textm placed on a map?
Thanks

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Sean de Wolski
Sean de Wolski 2015-3-16
grab the handle to the text object, then you can delete it
h = textm(etc)
To delete
delete(h);

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