Combo box flickering in Window 10 Touch screen - wpf

I am using a WPF Combobox in my Wpf application.
Following are my issue scenario:
1.Open combo box using touch
2.Touch on any item from drop down list
3.Combo box drop down list close after a flickering.
This issue is not there in mouse click.
I made AllowsTransparency="True" for windows
System Specification:
1.Windows 10
2.Visual Studio 2017
3.Unchecked "Enable press and hold for right clicking" in Pen and Touch setting
Following is my Xaml.code:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d" WindowState="Maximized" WindowStyle="None"
Title="MainWindow" Height="800" Width="800" Background="Transparent" AllowsTransparency="True">
<Grid>
<ComboBox Name="cb" Height="50" Width="50">
<ComboBoxItem>A</ComboBoxItem>
<ComboBoxItem>B</ComboBoxItem>
<ComboBoxItem>C</ComboBoxItem>
<ComboBoxItem>D</ComboBoxItem>
<ComboBoxItem>E</ComboBoxItem>
<ComboBoxItem>F</ComboBoxItem>
<ComboBoxItem>G</ComboBoxItem>
</ComboBox>
</Grid>
</Window>
Please help

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Combo Box touch events not firing in Windows 10 VS2017

Created a test application with a wpf combo box.
Using touch select an item from Combo box,after selecting the item combo box close after a flickering.
This flickering is not observed using mouse clicks.
Following are the specification for Application:
1.Made AllowsTransparency="True" for windows
2.Unchecked "Enable press and hold for right clicking" in Pen and Touch setting
System Specification:
1.Windows 10
2.VS 2017 and .Net framework 4.7
Some search results shows it is a common issue in Windows 10 that when windows is transparent touch events are not firing.
On Windows 10 (1803), all applications lost touch or stylus if a WPF transparent window covers on them
Workaround mentioned in it is not working in our case.(ResizeMode="NoResize") .
Is there any other workaround for this?
Following is my xaml code:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d" WindowState="Maximized" WindowStyle="None"
Title="MainWindow" Height="800" Width="800" Background="Transparent" AllowsTransparency="True">
<Grid>
<ComboBox Name="cb" Height="50" Width="50">
<ComboBoxItem>A</ComboBoxItem>
<ComboBoxItem>B</ComboBoxItem>
<ComboBoxItem>C</ComboBoxItem>
<ComboBoxItem>D</ComboBoxItem>
<ComboBoxItem>E</ComboBoxItem>
<ComboBoxItem>F</ComboBoxItem>
<ComboBoxItem>G</ComboBoxItem>
</ComboBox>
</Grid>
</Window>

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Regards,
Priyanga B

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