c# - Why cant I add more then 1 item in Visual Studio? -

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so i'm not new visual studio, , that's why confusing.

i'm working android app , i'm trying add stuff toolbox doesn't let me add more 1 object.

i.e have large text in there , when try add person name (or else) doesn't let me, when double click item.

i made gif visually show what's happening. here gif

what restored , crucial have line of code right here

setcontentview(resource.layout.main);


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