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I'm trying to do a custom button to my form (which has FormBorderStyle = none) using Visual Studio 2005. I have my 3 states button images in an ImageList linked to the button. this.btnClose.AutoSize = false; this.btnClose.BackColor = System.Drawing.Color.Transparent; this.btnClose.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Center; this.btnClose.FlatAppearance.BorderSize = 0; this.btnClose.FlatStyle = System.Windows.Forms.FlatStyle.Flat; this.btnClose.ForeColor = System.Drawing.Color.Transparent; this.btnClose.ImageKey = "Disabled"; this.btnClose.ImageList = this.imageList1; this.btnClose.Location = new System.Drawing.Point(368, -5); this.btnClose.Margin = new System.Windows.Forms.Padding(0); this.btnClose.Name = "btnClose"; this.btnClose.Size = new System.Drawing.Size(31, 31); this.btnClose.TabIndex = 0; this.btnClose.UseVisualStyleBackColor = false; this.btnClose.MouseLeave += new System.EventHandler(this.btnClose_MouseLeave); this.btnClose.Click += new System.EventHandler(this.btnClose_Click); this.btnClose.MouseDown += new System.Windows.Forms.MouseEventHandler(this.btnClose_MouseDown); this.btnClose.MouseHover += new System.EventHandler(this.btnClose_MouseHover); private void btnClose_MouseHover(object sender, EventArgs e) { btnClose.ImageKey = "enabled"; } private void btnClose_MouseDown(object sender, MouseEventArgs e) { btnClose.ImageKey = "down"; } private void btnClose_MouseLeave(object sender, EventArgs e) { btnClose.ImageKey = "disabled"; } All is working, but there's one catch. Whenever I move the mouse hover the button I get a really annoying grey background. How can I remove that?

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