I have created functions that can display graphs and tables of csv files in a GUI I am making with tkinter.

I have a `menubar` with an *import* button, a *plot* button, and a *table* button. The *plot* and *table* button can successfully plot graphs and tables of csv files respectively.

What I'd like to do, is when the user selects the *import* button, they select a file of their choice. Then, if they happen to select the *plot* button, the plot function works on the file they chose from *import*. Moreover, if they happen to select the *table* button, the table function works on the file they chose from *import*.

I have created a file opening function called `openfile()` which remembers the name of the file opened. 

The problem is that I don't know how to use `menubar` and `openfile()` such when the *import* button is clicked, my application stores the filename. 

Any tips on how I would go about doing this? 

Here's the code I've written for the `menubar` and `openfile()`:

```
def openfile():
    name= askopenfilename() 
    return (name[19:])

class MyApp(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self, *args, **kwargs)

        tk.Tk.wm_title(self, "MyApp")
        # main frame
        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        # creates the menubar at the top of the window
        menubar = tk.Menu(container)

        # import menu for importing csv files, initializes a file opening function (tbd)
        filemenu = tk.Menu(menubar, tearoff=0)
        filemenu.add_command(label="Import a CSV File", command = file_openerfunction)
        menubar.add_cascade(label= "Import", menu=filemenu)

        # plot menu for creating graphs and figures
        Plot = tk.Menu(menubar, tearoff =0 )
        Plot.add_command(label="Plot My CSV File", command= popupgraph)
        menubar.add_cascade(label="Plot", menu=Plot)

        # table menu for viewing data in a table
        table = tk.Menu(menubar, tearoff = 0)
        table.add_command(label="View MY CSV File", command = table)
        table.add_cascade(label = "View Data", menu = table)

        tk.Tk.config(self, menu=table)
        ....
        ....

```