The new API in AutoCAD 2014 includes the Window.Focus method. This method is very useful if you were using palette to call a command that requires AutoCAD to prompt for user input. In earlier versions of AutoCAD, the AutoCAD editor did not receive focus until the editor was clicked. This was a bit troublesome as it required an additional mouse click. The way to overcome it was to either call the "SetFocus" Win32 API through a dllimport or to use an internal undocumented method : "Internal.Utils.SetFocusToDwgView".
With AutoCAD 2014, the "Window.Focus" method can be used instead. As an example, if you had a button in the palette to insert a block named "Autodesk", then you can use the Window.Focus method from the button click callback method as :
using Autodesk.AutoCAD.ApplicationServices;
using AAA = Autodesk.AutoCAD.ApplicationServices;
private void InsertBlockBtn_Click(object sender, EventArgs e)
{
AAA.Document activeDoc
= AAA.Application.DocumentManager.MdiActiveDocument;
dynamic acadDocObj = activeDoc.GetAcadDocument();
activeDoc.Window.Focus();
acadDocObj.SendCommand(String.Format("-Insert\nAutodesk\n"));
// or
//object acadDocObj = activeDoc.GetAcadDocument();
//activeDoc.Window.Focus();
//object[] OnedataArry = new object[1];
//OnedataArry[0] = String.Format("-Insert\nAutodesk\n");
//acadDocObj.GetType().InvokeMember(
// "SendCommand",
// System.Reflection.BindingFlags.InvokeMethod,
// null, acadDocObj, OnedataArry
//);
}