If you fire *myButton_ServerClick* event, postback is invoked and ASP.Net want to fire called event, but your control is not added to the page, that's why ASP.Net ignore this event.
After postback and before event to be fired, you must add your control again and after them, event will be invoked.
Update
Something like this
Page:
<asp:Button runat="server" ID="btnTest" Text="Add control" OnClick="btnTest_Click"/>
<asp:Label runat="server" ID="result"></asp:Label>
<asp:HiddenField runat="server" ID="controlLoaded"/>
<asp:PlaceHolder runat="server" ID="phTest"></asp:PlaceHolder>
Code behind:
protected void Page_Load(object sender, EventArgs e)
{
if (controlLoaded.Value == "1")
{
AddControl();
}
}
protected void btnTest_Click(object sender, EventArgs e)
{
AddControl();
}
protected void myButton_ServerClick(object sender, EventArgs e)
{
result.Text = "OK";
}
public object getControl()
{
var ph = new PlaceHolder();
var exportInbBtn = new Button();
exportInbBtn.Text = "Export Inventury";
exportInbBtn.Click += new EventHandler(myButton_ServerClick);
ph.Controls.Add(exportInbBtn);
exportInbBtn.ID = "exportInbBtn";
return ph;
}
private void AddControl()
{
var actualObject = (PlaceHolder)getControl();
phTest.Controls.Add(actualObject);
controlLoaded.Value = "1";
}