Yes, you're right. It worked using command buttons. I am using a checkbox, and hadn't initialised the variable first, so it was treating it as numeric instead of logical. That was the 'data type mismatch'.

Thanks for your help.

>I tested this in VFP 6 SP3. I put a textbox with no PasswordChar and then two commandbuttons, one to set it to "*" and the other to set it to "" (display normally). Both commandbuttons worked as expected. Maybe something else is at work here?
>
>
>>I have a textbox for entering passwords. It is usually masked using the '*' character in the passwordchar property.
>>
>>I'd like to have the ability to remove the masking on the fly, so the System Administrator can see the password, while a 'normal' user can't, but when I try to change the passwordchar property as below, I get an error, which says there is a data type mismatch.
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>>THISFORM.PASSDISPLAY.PASSWORDCHAR="*"
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>>The help says the property is character, and is available at run time. Does anyone know if I can change it on the fly and if so, how?
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>>I'm using VFP5a SP3
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>>Thanks in advance
>>
>>David O'Brien