UsageStep 1: Add a reference to HandyControls or search for HandyControls on the nuget;
Step 2: Add code in App.xaml as follows:
OverviewLatest examplesWinUI Mica MaterialAutoCompleteTextBoxElementGroupUniformSpacingPanelFlexPanelCheckComboBoxImageSelectorPropertyGridHistory publicationScreenshotGooeyEffectGlowWindowFlowDocumentScrollViewerStylePinBoxEffectsRelativePanelDrawerPoptipDividerGeometryAnimationSplitButtonFloatingBlockHoneycombPanelRunningBlockImageBlockMagnifierCardButtonGroupGridSideMenuNotifyIconDialogWaveProgressBarBadgeGravatarGoToTopChatBubbleLabelTransferProgressButtonCoverFlowCoverViewMessageBoxWaterfallPanelRateBlurWindowFlipClockShieldOutlineTextTagToolBarSliderRangeSliderCircleProgressBarButtonStyleToggleButtonStyleRadioButtonStyleCheckBoxStyleListBoxStyleTreeViewStyleListViewStyleDataGridNow you can switch to dark themeColorPickerLoadingCarouselPaginationExpanderTimeBarImageBrowserPreviewSliderCompareSliderGrowlAnimationPathProgressBarTabControlTabControlStyleGroupBoxStepBarGifImageContextMenuCalendarClockCalendarWithClockTextBlockRichTextBoxStyleTextBoxComboBoxNumericUpDownSearchBarPasswordBoxDatePickerTimePickerDateTimePickerScrollViewerCirclePanelTransitioningContentControlBorderStyleBrush |