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API > API/Plugins > API/Plugins/ModelViewViewModel > API/Plugins/ModelViewViewModel/FMVVMViewClass_Source
Description
The source GetOrCreateInstance can fail. The view will not warn if a binding can't execute because the source is invalid.
| Name | IsOptional |
| Type | function |
| Header File | /Engine/Plugins/Runtime/ModelViewViewModel/Source/ModelViewViewModel/Public/View/MVVMViewClass.h |
| Include Path | #include "View/MVVMViewClass.h" |
bool IsOptional() const