Change item size dynamically

Hii All
I need to change an item size dynamically. For eg. If i have an item size (width) 20 and i entered text of 100 alphabates then the size of item is increase dynamically along with text.
I use set_item_property but it shows an error that *" Cannot resize item. Position of item places it off of canvas. "*
Please Assist.
Pradhyumn

write both the actions at the same time
if the canvas size is less then the field size plus the increament then increase the size of the canvas tooo...

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Change item size dynamically

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