deleting and redraw new buttons

[chabis]

hello,
i'm new on QT, and i work (for blender), to have a character picker.
for each part of my character, i create a button to select it.
so because i have potentially several character, with some special parts (like dress or short) i create a button to delete and re-create buttons for selecting parts. deleting is ok, recreate seem working well, but no (new) buttons are visibles. and i don't understand why. i try several things, but nothing...

my init part:

    def init_ui(self):
        # layout general
        self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
        ###------------------------------------------------------###
        #self.verticalLayout = QtWidgets.QVBoxLayout(self)
        #self.verticalLayout.setObjectName('verticalLayout')

        self.topLeftLayout = QtWidgets.QWidget(self)
        self.topLeftLayout.setGeometry(QtCore.QRect(0, 0, 300, 200))
        self.topLeftLayout.setObjectName("topLeftLayout")

        self.topMiddleLayout = QtWidgets.QWidget(self)
        self.topMiddleLayout.setGeometry(QtCore.QRect(300, 0, 300, 200))
        self.topMiddleLayout.setObjectName("topMiddleLayout")

        self.topRightLayout = QtWidgets.QWidget(self)
        self.topRightLayout.setGeometry(QtCore.QRect(600, 0, 300, 200))
        self.topRightLayout.setObjectName("topRightLayout")

        self.pantinLayout = QtWidgets.QWidget(self)
        self.pantinLayout.updatesEnabled()
        self.pantinLayout.setGeometry(QtCore.QRect(250, 200, 500, 600))
        self.pantinLayout.setObjectName("topRightLayout")

        ###-------------------------------------------------------###
        self.Radio_obj_name = QtWidgets.QPushButton("update character", parent=self.topLeftLayout)
        self.Radio_obj_name.setObjectName(u"pushButton")
        self.Radio_obj_name.setGeometry(QtCore.QRect(10, 10, 120, 23))
        self.Radio_obj_name.setCheckable(True)

        ###-------------------------------------------------------###

        self.butgroup = QtWidgets.QButtonGroup(self)
        self.createPantin()
        self.Radio_obj_name.clicked.connect(self.change_character)

the creation part for character buttons

    def createPantin(self):
        if len(bpy.context.view_layer.objects.selected) > 0:
            sel = bpy.context.view_layer.objects.selected[0]
            if sel.type == 'ARMATURE':
                print("parla")
                self.pantpart = []

                # creation des switch
                for i in self.swt:
                    if i in self.layers:
                        self.createSwitch(i)
                # creation du pantin
                for i in self.bmps:
                    for j in self.buttons:
                        for k in self.buttons[j]:
                            if i == k:
                                name = self.bmpPath+i+".png"
                                self.path = name.replace("\\","/")
                                self.but = QtWidgets.QPushButton("", parent=self.pantinLayout)
                                self.but.setAccessibleName(j+"/"+i)
                                self.but.setGeometry(
                                                    (self.bmps[i][0]/self.ratio)-self.Hoffset,
                                                    (self.bmps[i][1]/self.ratio)-self.Voffset,
                                                    self.bmps[i][2]/self.ratio,
                                                    self.bmps[i][3]/self.ratio
                                                    )
                                self.but.setStyleSheet("QPushButton{image:url("+self.path+"); border:none}")
                                self.butgroup.addButton(self.but)
                                self.pantpart.append(self.but)


                # connection bouton
                self.butgroup.buttonClicked.connect(self.selectpart)                

and the code called by the button to update

    def change_character(self):
        #self.verticalLayout.removeWidget(self.pantinLayout)
        #self.pantinLayout.deleteLater()
        for i in self.pantpart:
            i.deleteLater()

        self.characterID()
        self.organize()
        self.createPantin()
        for i in self.pantpart:
            i.repaint()
            i.update()

if someone could explain me what i don't understand

[jsulm]

@chabis Call show() on each created button.

[chabis]

humm... i've try but nothing change.
... it's a mystery for me

[jsulm]

@chabis Did you debug your code? Did you verify that buttons were indeed created? Did you verify whether you set proper geometry (not sure why you do that at all)?

[chabis]

yes , i've done all i can, and finally it's ok.
and the problems seem to be in the widget where i put my buttons. all was create correctly but nothing was visible. i 've changed the kind of widget i use, and now it's ok.
(i need to say that not is clear in my mind about how qt is working.)

thanks for all @jsulm