❔ [WPF] How to use method at other file without static, making object ?

I wanna use StickyNotesMainView.cs file's MainAddTextBox_Click method to StickyNotesView.cs file without static and making constructor. If i use static, then I can't allocate variance in MainAddTextBox_Click method. and If i use constructor like picture, then I can't do what I want that add textblock in MainView App.. https://paste.mod.gg/jehvlfifxyyi/3 <- this is my code

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