[Tkinter-discuss] strange grid-layout manager behaviour

[GKalman]

I'm just "switching" from the pack-layout manager to the grid-layout manager. 

I'm trying to understand why Button b3 is NOT centered like the other two
buttons (b1 & b2). See my "mini-script" below.

What  am I doing wrong?

*******************************************


from Tkinter import *
#=================================================
class Example:
    
    def __init__(self, parent): 
         
        self.parent = parent
        self.parent.geometry("+400+100")  

        frm1=Frame(self.parent,bg="cyan")
        frm1.columnconfigure(0,minsize=200)
        frm1.grid(row=0,column=0)

        frm3=Frame(self.parent,bg="orange")
        frm3.columnconfigure(1,minsize=200)
        frm3.grid(row=0,column=1)
        
        frm2=Frame(self.parent,bg="yellow")
        frm2.columnconfigure(0,minsize=400)
        frm2.grid(row=1,column=0,columnspan=2)

        b1=Button(frm1,text="1",bg="green")
        b1.grid(in_=frm1,row=0,column=0)
        
        b3=Button(frm3,text="3",bg="green")
        b3.grid(in_=frm3,row=0,column=0)
        
        b2=Button(frm2,text="2",bg="green")
        b2.grid(in_=frm2,row=0,column=0)
        
        self.parent.grid() 
#=====================================================
def main():  
    root = Tk()
    app = Example(root)
    root.mainloop()  
#===================================================
if __name__ == '__main__':
    main() 

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