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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?
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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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