diff --git a/source/numbertextctrl.cpp b/source/numbertextctrl.cpp
index bbd4ca2f..51004bc4 100644
--- a/source/numbertextctrl.cpp
+++ b/source/numbertextctrl.cpp
@@ -21,27 +21,29 @@
 BEGIN_EVENT_TABLE(NumberTextCtrl, wxTextCtrl)
 EVT_KILL_FOCUS(NumberTextCtrl::OnKillFocus)
 EVT_TEXT_ENTER(wxID_ANY, NumberTextCtrl::OnTextEnter)
+EVT_TEXT(wxID_ANY, NumberTextCtrl::EnsureOnlyNumbers)
 END_EVENT_TABLE()
 
-NumberTextCtrl::NumberTextCtrl(wxWindow* parent, wxWindowID id, long value, long minvalue, long maxvalue, const wxPoint &pos, const wxSize &sz, long style, const wxString &name) :
-	wxTextCtrl(parent, id, (wxString() << value), pos, sz, style, wxTextValidator(wxFILTER_NUMERIC), name),
-	minval(minvalue), maxval(maxvalue), lastval(value) {
-	////
+void NumberTextCtrl::OnKillFocus(wxFocusEvent &evt) {
+	CheckRange();
+	evt.Skip();
 }
 
-NumberTextCtrl::NumberTextCtrl(wxWindow* parent, wxWindowID id, long value, long minvalue, long maxvalue, long style, const wxString &name, const wxPoint &pos, const wxSize &sz) :
-	wxTextCtrl(parent, id, (wxString() << value), pos, sz, style, wxTextValidator(wxFILTER_NUMERIC), name),
-	minval(minvalue), maxval(maxvalue), lastval(value) {
-	////
-}
+wxString NumberTextCtrl::TextFilterDigits(const wxString &text) {
+	wxString newText;
+	for (size_t position = 0; position < text.size(); ++position) {
+		if (text[position] >= '0' && text[position] <= '9') {
+			newText.Append(text[position]);
+		}
+	}
 
-NumberTextCtrl::~NumberTextCtrl() {
-	////
+	return newText;
 }
 
-void NumberTextCtrl::OnKillFocus(wxFocusEvent &evt) {
-	CheckRange();
-	evt.Skip();
+void NumberTextCtrl::EnsureOnlyNumbers(wxCommandEvent &evt) {
+	const auto newText = TextFilterDigits(GetValue().ToStdString());
+
+	ChangeValue(newText);
 }
 
 void NumberTextCtrl::OnTextEnter(wxCommandEvent &evt) {
@@ -49,66 +51,56 @@ void NumberTextCtrl::OnTextEnter(wxCommandEvent &evt) {
 }
 
 void NumberTextCtrl::SetIntValue(long value) {
-	wxString sv;
-	sv << value;
 	// Will generate events
-	SetValue(sv);
+	SetValue(wxString::Format("%i", value));
 }
 
 long NumberTextCtrl::GetIntValue() {
 	long l;
-	if (GetValue().ToLong(&l)) {
-		return l;
-	}
-	return 0;
+	return GetValue().ToLong(&l) ? l : 0;
 }
 
 void NumberTextCtrl::SetMinValue(long value) {
-	if (value == minval) {
+	if (value == minValue) {
 		return;
 	}
-	minval = value;
+	minValue = value;
 	CheckRange();
 }
 
 void NumberTextCtrl::SetMaxValue(long value) {
-	if (value == maxval) {
+	if (value == maxValue) {
 		return;
 	}
-	maxval = value;
+	maxValue = value;
 	CheckRange();
 }
 
 void NumberTextCtrl::CheckRange() {
 	auto text = GetValue().ToStdString();
-	wxString ntext;
 
-	for (size_t s = 0; s < text.size(); ++s) {
-		if (text[s] >= '0' && text[s] <= '9') {
-			ntext.Append(text[s]);
-		}
-	}
+	auto newText = TextFilterDigits(text);
 
 	// Check that value is in range
 	long v;
-	if (ntext.size() != 0 && ntext.ToLong(&v)) {
-		if (v < minval) {
-			v = minval;
-		} else if (v > maxval) {
-			v = maxval;
+	if (newText.size() != 0 && newText.ToLong(&v)) {
+		if (v < minValue) {
+			v = minValue;
+		} else if (v > maxValue) {
+			v = maxValue;
 		}
 
-		ntext.clear();
-		ntext << v;
-		lastval = v;
+		newText.clear();
+		newText = wxString::Format("%i", v);
+		lastValue = v;
 	} else {
-		ntext.clear();
-		ntext << lastval;
+		newText.clear();
+		newText = wxString::Format("%i", lastValue);
 	}
 
 	// Check if there was any change
-	if (ntext != text) {
+	if (newText != text) {
 		// ChangeValue doesn't generate events
-		ChangeValue(ntext);
+		ChangeValue(newText);
 	}
 }
diff --git a/source/numbertextctrl.h b/source/numbertextctrl.h
index 8db42ba0..e848eb3f 100644
--- a/source/numbertextctrl.h
+++ b/source/numbertextctrl.h
@@ -21,12 +21,21 @@
 // Text ctrl that only allows number input
 class NumberTextCtrl : public wxTextCtrl {
 public:
-	NumberTextCtrl(wxWindow* parent, wxWindowID id = wxID_ANY, long value = 0, long minvalue = 0, long maxvalue = 100, const wxPoint &pos = wxDefaultPosition, const wxSize &sz = wxDefaultSize, long style = 0, const wxString &name = wxTextCtrlNameStr);
-	NumberTextCtrl(wxWindow* parent, wxWindowID id = wxID_ANY, long value = 0, long minvalue = 0, long maxvalue = 100, long style = 0, const wxString &name = wxTextCtrlNameStr, const wxPoint &pos = wxDefaultPosition, const wxSize &sz = wxDefaultSize);
-	~NumberTextCtrl();
+	// Please avoid using wxTextValidator rather than wxFILTER_NONE, because it prevents the event clipboard paste to be fired.
+	NumberTextCtrl(wxWindow* parent, wxWindowID id, long value, long minValue, long maxValue, const wxPoint &pos, const wxSize &sz, long style, const wxString &name) :
+		wxTextCtrl(parent, id, wxString::Format("%i", value), pos, sz, style, wxTextValidator(wxFILTER_NONE), name),
+		minValue(minValue), maxValue(maxValue), lastValue(value) { }
+	// Please avoid using wxTextValidator rather than wxFILTER_NONE, because it prevents the event clipboard paste to be fired.
+	NumberTextCtrl(wxWindow* parent, wxWindowID id, long value, long minValue, long maxValue, long style, const wxString &name, const wxPoint &pos, const wxSize &sz) :
+		wxTextCtrl(parent, id, wxString::Format("%i", value), pos, sz, style, wxTextValidator(wxFILTER_NONE), name),
+		minValue(minValue), maxValue(maxValue), lastValue(value) { }
+	~NumberTextCtrl() = default;
 
 	void OnKillFocus(wxFocusEvent &);
 	void OnTextEnter(wxCommandEvent &);
+	void EnsureOnlyNumbers(wxCommandEvent &evt);
+
+	wxString TextFilterDigits(const wxString &string);
 
 	long GetIntValue();
 	void SetIntValue(long value);
@@ -37,7 +46,7 @@ class NumberTextCtrl : public wxTextCtrl {
 protected:
 	void CheckRange();
 
-	long minval, maxval, lastval;
+	long minValue, maxValue, lastValue;
 	DECLARE_EVENT_TABLE();
 };