0x0 empty GraphicsPlaceholder array
I am trying to obtain the handle of a TextBox in a GUI window.
>> SliderTool
>> h = findobj('Tag', 'xText')
h =
0x0 empty GraphicsPlaceholder array.
>>
Why is h an empty array?
Solution
By default (at least in R2015b) the GUI figure's property HandleVisibility is set to callback this prevents findobj to find the handle of the uicontrols even if the HandleVisibility of the uicontrol is set to on.
To solve your problem, you have to set the HandleVisibility property of the figure to on too.
The following picture shows how to set the HandleVisibility of the GUI figure and the result.
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