set_value() to a button in a file_dilaog callback doesn't work

[chesterrc]

Version of Dear PyGui

Version: 1.11.1
Operating System: Windows 10

My Issue/Question

When I try to use set_value() to a button within a callback for a file_dialog(), the button's value is not set.

To Reproduce

Steps to reproduce the behavior:

1. Create a button
2. Create a hidden file_dialog window
3. Create a file_select function with the arguments of sender and app_data to set the value of the button to app_data["file_path_name"] then print the get_value of the button
4. Set a callback on the button to show file_dialog window
5. Set the file_dialog function as the callback to the file_dialog
6. Run the python script, click the button, select a file, and check on the print statements.

Expected behavior

The print statement will have an output of "None"

Screenshots/Video

Standalone, minimal, complete and verifiable example

import dearpygui.dearpygui as dpg


def file_select(sender, app_data):
    print(app_data)
    dpg.set_value("button", app_data["file_path_name"])
    print(dpg.get_value("button"))


dpg.create_context()
dpg.create_viewport(title='Test For Set Value', width=600, height=200)
dpg.setup_dearpygui()

with dpg.window(label="Test"):
    dpg.add_button(
                    label="button",
                    tag="button",
                    callback=lambda: dpg.show_item("file_dialog")
                    )

with dpg.file_dialog(show=False, label="choose a file",
                    tag="file_dialog", callback=file_select):
    dpg.add_file_extension(".*")


dpg.show_viewport()
dpg.start_dearpygui()
dpg.destroy_context()

[v-ein]

What do you expect to get by setting a value on a button?

[chesterrc]

I expected to get the path to a .csv file. I'm essentially creating a config window that has several other items, and when a user presses the "run" button, I expected to get the values of all the child items of the window.

[v-ein]

So did I get it correctly that you're trying to save values obtained via the file_select callback in order to access them later? If so,

1. You can use dpg.set_item_user_data() instead of set_value(). This way you'll be able to retrieve the value later with dpg.get_item_user_data().
2. You can store the value in a global variable or a class member. This will probably be more convenient (especially with a class member) than set_item_user_data. BTW if you specify a member function as a DPG callback, that function does receive self and can therefore access member fields. That is, storing or retrieving the value is just one line like this:

class MyConfigDialog:
    selected_file: str = ""

    def file_select(self, sender, app_data):
        self.selected_file = app_data["file_path_name"]

Buttons, as well as some other widgets, do not have a value, and set_value is just ignored.