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Signature Pad in Modal

When using a signature pad inside of a modal strange things happen if you want to customize the size of the signature area.  This is probably because the signature canvas does not exist until the modal is opened.  


In the attached project, there are 2 buttons.  The first button pops up a modal with a signature pad.  The signature pad is given a custom height and width.  As you can see, trying to sign does funny things.  You can't quite sign correctly but the images does save and display on the screen.


On the second button, I added a bit of JavaScript to resize the canvas after it's displayed.  This fixes the signing area, however now a call to "GetSignatureAsync" now saves the image in the default size of 150x300, cutting off part of the image.


Is there a workaround to use a signature pad in a modal?