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Microsoft Forms docking to top-left. C#

I'm fairly new to programming and this is my first Forms program.
I'm trying to place buttons inside a panel in a manner that they get automatically sorted by alphabetical order.
At first I was trying with a FlowLayoutPanel, which displayed the buttons with the correct size and placement, but not sorted by Alphabetical order:
With FlowLayoutPanel. Ideal Size and placement, but no sorting.
I also had a few problems while trying to automatically scale it to screen size.
After failing with a FlowLayoutPanel, I tried just a normal panel. It fixed all my previous problems, but would stretch the buttons when docked:
With a normal panel. Perfect sorting and scaling, but stretching.
Here is the code, if it matters:
Button modButton = new Button();
modButton.Location = new System.Drawing.Point(3, 3);
modButton.Name = skinName;
modButton.Size = new System.Drawing.Size(200, 200);
modButton.TabIndex = 0;
modButton.Text = skinName;
modButton.TextAlign = System.Drawing.ContentAlignment.BottomCenter;
modButton.UseVisualStyleBackColor = true;
modButton.BackgroundImageLayout = ImageLayout.Zoom;
modButton.Dock = System.Windows.Forms.DockStyle.Left;
modButton.Click += new System.EventHandler(this.modButton_Click);
modButton.TextImageRelation = System.Windows.Forms.TextImageRelation.ImageAboveText;
this.panel2.Controls.Add(modButton);
modList.Add(skinName);
And for the panel:
this.panel2.AutoScroll = true;
this.panel2.AutoSize = true;
this.panel2.BackColor = System.Drawing.SystemColors.Control;
this.panel2.Dock = System.Windows.Forms.DockStyle.Fill;
this.panel2.Location = new System.Drawing.Point(0, 0);
this.panel2.Name = "panel2";
this.panel2.Size = new System.Drawing.Size(636, 450);
this.panel2.TabIndex = 7;

BackgroundImage layout to Bottom

I have a task, that can be easily completed with html/css, but I cant figure out how to do it with C# WindowsForms.
I need to create container with dinamic height and with 3 types of BackgroundImage's. To do so I created panel1 and set BackgroundImageLayout of "body.jpg" to tile.
Then I put panel2 and set BackgroundImageLayout of "top.jpg" to none.
So I need to create only one container with "bottom.jpg" but here is the problem.
Image is tall and it must have layout to bottom, but I cant set BackgroundImage of panel3 to Bottom and I cant dock PictureBox to bottom, because in that case it will prevent to set content overlay.
P.S. Sorry if you cant understand some of my explanations - my native language is Russian.
Here is what constuctor created for me:
//
// Charsheet_bg
//
this.Charsheet_bg.AutoSize = true;
this.Charsheet_bg.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("Charsheet_bg.BackgroundImage")));
this.Charsheet_bg.Controls.Add(this.Charsheet_top);
this.Charsheet_bg.Dock = System.Windows.Forms.DockStyle.Left;
this.Charsheet_bg.Location = new System.Drawing.Point(0, 0);
this.Charsheet_bg.Margin = new System.Windows.Forms.Padding(0);
this.Charsheet_bg.MinimumSize = new System.Drawing.Size(285, 0);
this.Charsheet_bg.Name = "Charsheet_bg";
this.Charsheet_bg.Size = new System.Drawing.Size(285, 488);
this.Charsheet_bg.TabIndex = 30;
//
// Charsheet_top
//
this.Charsheet_top.BackColor = System.Drawing.Color.Transparent;
this.Charsheet_top.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("Charsheet_top.BackgroundImage")));
this.Charsheet_top.BackgroundImageLayout = System.Windows.Forms.ImageLayout.None;
this.Charsheet_top.Dock = System.Windows.Forms.DockStyle.Fill;
this.Charsheet_top.Location = new System.Drawing.Point(0, 0);
this.Charsheet_top.MinimumSize = new System.Drawing.Size(285, 200);
this.Charsheet_top.Name = "Charsheet_top";
this.Charsheet_top.Size = new System.Drawing.Size(285, 488);
this.Charsheet_top.TabIndex = 31;
And screenshot will be in 5 mins.
Screenshot with tooltips

Overlapping PicuresBox with transparent background

I want make two or more overlapping PictureBox with transparent background but if I do this I see only one Image:
I create my PictureBoxes like this:
PictureBox pb1 = new PictureBox();
pb1.Size = new Size(32, 32);
pb1.Location = new Point(0,0);
pb1.Image = Image.FromFile("../Graphics/Grounds/ground.png");
pb1.Visible = true;
PictureBox pb2 = new PictureBox();
pb2.Size = new Size(32, 32);
pb2.Location = new Point(0,0);
pb2.Image = Image.FromFile("../Graphics/Grounds/human.png");
pb2.Visible = true;
Later I add those two PictureBoxes to my Panel:
panel1.Controls.Add(pb1);
panel1.Controls.Add(pb2);
So why does it only shows one PictureBox?

Try change panel1.Controls.Add(pb2); to pb1.Controls.Add(pb2);
Make sure you set the correct location as pb1 be the container

If your human.png has transparent background:
pb2.BackColor = Color.Transparent;

Drawing animation on combobox

There is a lot of already answered question and examples about how to draw images within combobox. But I haven't found any examples how to draw animations within combobox.
The gif animation I use is (it's transparent):
And the result I want to achieve is somethink like this:
I'm using Windows Forms and .Net 3.5.
All ways of achieving that, I thought about, were:
1. Use Graphics.DrawImage in ComboBox's DrawItem handler. But the image was drawn statically, there was no anmation.
2. Use PictureBox to show animation and then somehow resize it and place over the ComboBox.
For second soultion I used the following code:
pictureBox1 = new PictureBox();
pictureBox1.Image = Resource.myImage;
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
//3 is used just for try to fit image into "white" area of ComboBox
pictureBox1.ClientSize = new Size(comboBox1.Size.Height-3, comboBox1.Size.Height-3);
pictureBox1.BackColor = System.Drawing.Color.Transparent;
pictureBox1.Dock = DockStyle.Left;
pictureBox1.Parent = this.comboBox1;
pictureBox1.Enabled = true;
pictureBox1.Visible = true;
But in result I've got this:
It's animated, but picturebox is drawn on ComboBox edges and it looks bad.
So, can anyone give me an advice or some help to achive this?
Thank you.
EDIT:
My final solution that worked:
pictureBox1 = new PictureBox();
pictureBox1.Image = Resource1.myImage;
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
pictureBox1.ClientSize = new Size(comboBox1.Size.Height - SystemInformation.Border3DSize.Height, comboBox1.Size.Height - (2 * SystemInformation.Border3DSize.Height));
pictureBox1.BackColor = System.Drawing.Color.Transparent;
pictureBox1.Location = new Point(SystemInformation.Border3DSize.Width, SystemInformation.Border3DSize.Height);
pictureBox1.Parent = this.comboBox1;
pictureBox1.Enabled = true;
pictureBox1.Visible = true;
Thank you all! You help me a lot!

Try this:
pictureBox1 = new PictureBox();
pictureBox1.Image = Resource.myImage;
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
//2 is used just for try to fit image into "white" area of ComboBox
pictureBox1.ClientSize = new Size(comboBox1.Size.Height - 2, comboBox1.Size.Height - 2);
pictureBox1.BackColor = System.Drawing.Color.Transparent;
pictureBox1.Left = 1;
pictureBox1.Top = 1;
pictureBox1.Parent = this.comboBox1;
pictureBox1.Enabled = true;
pictureBox1.Visible = true;

remove the code that sets the "Dock" property. Setting this causes the layout manager to ignore size/location settings.
Instead, set the Size property and the Location property to specific values.
Something like:
pictureBox3.Size = new Size(comboBox1.Size.Height-3, comboBox1.Size.Height-3);
pictureBox3.Location = new Point(0, 3);
You may have to adjust these to get the extact position you need.

It might be then a tad too small, but it would fit, if you set the size of your combobox to pictureBox1.Size = new Size(comboBox1.ItemHeight, comboBox1.ItemHeight).
Or set the height and width to 2*SystemInformation.3DBorderSize

Show image above SMFPlayer issue

An image (Image class) is placed above a SMFPlayer (both elements are created in code-behind). Z-index of the image is the Z-Index of SMFPlayer + 1. The image is resized (adjusting the width) according to the playing progress of SMFPlayer.
videoPlayer = new SMFPlayer();
videoPlayer.Width = 1920;
videoPlayer.Height = 1080;
videoPlayer.Margin = new Thickness(1920, 0, 0, 0);
PlaylistItem item = new PlaylistItem();
Random r = new Random();
item.MediaSource = new Uri("video.wmv");
item.DeliveryMethod = DeliveryMethods.ProgressiveDownload;
videoPlayer.Playlist.Add(item);
videoPlayer.AutoPlay = true;
videoPlayer.AutoLoad = true;
videoPlayer.IsControlStripVisible = false;
videoPlayer.PlaylistVisibility = FeatureVisibility.Disabled;
videoPlayer.MediaEnded += new EventHandler(player_MediaEnded);
LayoutRoot.Children.Add(videoPlayer);
bar_yellow3 = new Image();
bar_yellow3.Source = new BitmapImage(new Uri("/SMF_ProgressiveDownload1;component/assets/bar_y.png", UriKind.Relative));
bar_yellow3.Width = 775;
bar_yellow3.Height = 34;
bar_yellow3.Margin = new Thickness(2948,1034,0,0);
bar_yellow3.Stretch = Stretch.Fill;
bar_yellow3.VerticalAlignment = VerticalAlignment.Top;
bar_yellow3.HorizontalAlignment = HorizontalAlignment.Left;
LayoutRoot.Children.Add(bar_yellow3);
However, when the playing progress is less than 20%, the image blinks randomly. When the SMFPlayer is set to be invisible ( Visibility.Collapsed ) , the image is normal.
I have tried to call the update function of the Image, which is: bar_yellow3.UpdateLayout(); but the method does not solve the blinking issue.
Any solution?

Try use effects (Shazzam will help you) instead using Z order.