Python DelphiVCL GUI中GroupBox背景色设置无效的问题求助

我正在使用DelphiVCL for Python GUI库，尝试修改GroupBox组件的背景色但未成功。

我编写了以下代码创建Form及其中的GroupBox：

from delphivcl import *

class frmMain(Form):
    def __init__(self, owner):
    
        self.Caption = 'Hello World'
        self.Width = 1000
        self.Height = 500
        self.Position = "poScreenCenter"

        self.myGroupBox = GroupBox(self)
        self.myGroupBox.Parent = self
        self.myGroupBox.Align = "alClient"
        self.myGroupBox.Caption = "Hello World!"
        self.myGroupBox.Font.Size = 30

        self.myGroupBox.AlignWithMargins = True
        self.myGroupBox.Margins.Top = 100
        self.myGroupBox.Margins.Right = 100
        self.myGroupBox.Margins.Bottom = 100
        self.myGroupBox.Margins.Left = 100

        self.myGroupBox.StyleElements = ""
        self.myGroupBox.Color = "$00418964" # 绿色

我尝试设置绿色背景色（$00418964），并且按照相关说明清空了StyleElements，但背景色设置依然无效，运行后GroupBox并未显示预期的绿色背景。

要让GroupBox的自定义背景色生效，除了现有设置外，还需要关闭它的父背景继承属性：

在代码中添加一行：

self.myGroupBox.ParentBackground = False

修改后的完整代码：

from delphivcl import *

class frmMain(Form):
    def __init__(self, owner):
    
        self.Caption = 'Hello World'
        self.Width = 1000
        self.Height = 500
        self.Position = "poScreenCenter"

        self.myGroupBox = GroupBox(self)
        self.myGroupBox.Parent = self
        self.myGroupBox.Align = "alClient"
        self.myGroupBox.Caption = "Hello World!"
        self.myGroupBox.Font.Size = 30

        self.myGroupBox.AlignWithMargins = True
        self.myGroupBox.Margins.Top = 100
        self.myGroupBox.Margins.Right = 100
        self.myGroupBox.Margins.Bottom = 100
        self.myGroupBox.Margins.Left = 100

        self.myGroupBox.StyleElements = ""
        self.myGroupBox.ParentBackground = False  # 关闭父背景继承
        self.myGroupBox.Color = "$00418964" # 绿色

原因 #

ParentBackground默认值为True，会让GroupBox自动继承父控件（此处为Form）的背景样式，直接覆盖你设置的Color属性。配合清空StyleElements禁用系统样式影响，就能让自定义背景色正常显示。

内容的提问来源于stack exchange，提问作者Shaun Roselt